Colletes wacki Kuhlmann 2002

Proshchalykin, Maxim Yu. & Kuhlmann, Michael, 2015, Additional records of the genus Colletes Latreille (Hymenoptera: Apoidea: Colletidae) from Siberia, with a checklist of Russian species, Zootaxa 3949 (3), pp. 323-344 : 335-337

Colletes wacki Kuhlmann 2002

Colletes wacki Kuhlmann in Kuhlmann & Dorn 2002: 102 –103, ♀ (type locality: Mongolia).

Material examined. Tyva Republic: 13 ♀, Tore-Khol Lake [95°08'E 50°04'N], 30.VI–3.VII.2013, MYP, VML ( IBSS / RCMK); 7 ♀, 190 ♂, 11–12.VII.2014, ASL, MYP, VML ( IBSS); 1 ♀, 13 km SW Samagaltai, Dyttyg-Khem River [94°53'E 50°31'N], 8–11.VII.2013, MYP, VML ( IBSS); 1 ♂, 17.VII.2014, ASL, MYP, VML ( IBSS); 1 ♀, 25 km SE Erzin, Tes-Khem River [95°21'E 50°04'N], 14–15.VII.2014, ASL, MYP, VML ( IBSS).

Distribution in Siberia. *Tyva Republic.

General distribution. Russia ( Table 2), Kazakhstan, Mongolia, China.

Remarks. As a part of the present study large series of female C. wacki were collected and male specimens of what initially appeared to be C. conradti . The male of C. wacki has been unknown so these records in combination with earlier observations provided an opportunity to investigate the status of these males but also the intraspecific variation of females. Careful re-examination of most previously collected specimens from various parts of Central and East Asia revealed the existence of two very similar but consistently differing male morphotypes that can be clearly assigned to the females of C. conradti and C. wacki respectively. To finally make absolutely sure that one of the morphotypes represents C. conradti type material of this species housed in ZMHU was studied.

According to Noskiewicz (1936: 462) the description of C. conradti is based on 4 ♀ and 6 ♂ with types of female and male deposited in ZMHU: "Untersuchtes Material: 4 ♀, 6 ♂ von S. Conradt bei Jarkent, Polu und Chotan (Ostturkestan) in der Höhe von 1200–2215 m, im Juni und Juli 1890 gesammelt, Zool. Mus. Uniw. [sic] Berlin;" … " Type des ♀ und des ♂ im Zool. Mus. Uniw. [sic] Berlin." However, there were no explicit statements which of the ten specimens were designated as types. In the collection of the ZMHU 6 ♀ and 7 ♂ of C. conradti were found, all collected by S. Conradt in Turkestan and all belonging to a single species. Only 3 ♀ and 5 ♂ out of the originally 4 ♀ and 6 ♂ seem to still exist, all bearing Noskiewicz´determination labels but none with a type label. Noskiewicz usually clearly marked type specimens so it has to be assumed that the two designated type specimens are missing and might be lost. Thus, to clarify and stabilize the taxonomic situation for the future a lectotype was designated (see below). The specimens housed in ZMHU are:

6 ♀, 1 ♂ (3 ♀ with Noskiewicz´determination labels): " Chin. Turkestan, Tschakar b. Polu, 1950 m. 8.– 10.6.90, Conradt S"

2 ♂ (both with Noskiewicz´determination labels): " Chin. Turkestan, Chassan-Bugra, Jarkand, 1740 m. 9.7.90, Conradt S" One of the males here designated as lectotype.

1 ♂ (with Noskiewicz´determination label): " Chin. Turkestan, Chotan, 1200 m, 17.VI.90, L. Conradt S"

1 ♂ (with Noskiewicz´determination label): " Chin. Turkestan, Saibak b. Polu, 2115 m. 6.VI.90, Conradt S" (note that in the description 2215 m was written erroneously)

2 ♂ (1 ♂ with Noskiewicz´determination label): " Chin. Turkestan, King-Ssai, Jarkand, 1780 m. 10.7.90, Conradt S"

Re-examination of specimens revealed that all records of C. conradti from Mongolia (Kuhlmann 2009, Kuhlmann & Dorn 2002, Kuhlmann & Proshchalykin 2013b), eastern parts of China ( Niu et al. 2014) as well as Kyzylorda and Kostanai provinces of Kazakhstan ( Kuhlmann & Proshchalykin 2013a) are in fact C. wacki . To facilitate the identification of C. conradti and C. wacki we here provide images of females ( Fig. 5 ) and males ( Figs. 6 , 7 ) of both species and and present updated distribution maps ( Fig. 8 ). Colletes conradti generally has a more restricted southwestern distribution than C. wacki that is more widespread in Mongolia and neighbouring regions including the first records for Russia ( Fig. 8 ).

The male of C. wacki is here described for the first time.

Diagnosis. The male of C. wacki closely related to C. conradti . The former differs from C. conradti by a far larger, apically rounded pronotal spine ( Fig. 6 b) that is much shorter and apically pointed in C. conradti ( Fig. 6 ). In C. wacki the metasoma basally is distinctly wider ( Fig. 6 d) than in the more slender C. conradti ( Fig. 6 c). S 7 in C. wacki ( Fig. 7 b) is slightly longer and wider with a more pronounced apicolateral angle (more rounded in C.

conradti , Fig. 7 a) and the darker brown dorsolateral ridge is basally wider covering about 2/3 of the width (about half in C. conradti ). The gonostylus in both species is almost identical ( Figs 7 c, d).

Description. Male. Bl = 8.0–9.5 mm. Head. Head wider than long. Integument black except tips of mandible partly dark reddish-brown. Face densely covered with long, greyish-white, erect hairs. Malar area medially about 3/4 as long as width of mandible base, finely striate. Antenna black. Mesosoma. Integument black. Pronotum laterally with a very large apically rounded spine ( Fig. 6 b). Mesoscutal disc between punctures smooth and shiny; disc sparsely punctate (i = 2–3d). Scutellum anteriorly with few punctures but with slightly denser punctation apically, surface smooth and shiny. Mesoscutum, scutellum, metanotum, mesepisternum and propodeum covered with long, greyish-white erect hairs. Wings. Slightly yellowish-brown; wing venation dark brown. Legs. Integument black to dark reddish-brown. Vestiture white. Metasoma. Integument black except depressed apical tergal margins yellowish to reddish translucent ( Fig. 6 d). T1 completely and T2 medially sparsely covered with long, erect white hairs ( Fig. 6 d); apical tergal hair bands narrow, distinctly depressed ( Fig. 6 d). Disc of T1 with dense and moderately coarse punctation (i = 0.5–1d), between punctures smooth and shiny, on following terga punctation of discs successively smaller. T7 broadly rounded, without very small and shallow emargination. Terminalia. Genitalia and S7 as illustrated ( Figs 7 b, d).

Figures

FIGURE 5. Colletes conradti Noskiewicz, female: a. head; c. pronotal spine; e. metasomal terga 1 and 2. Colletes wacki Kuhlmann, female: b. head; d. pronotal spine; f. metasomal terga 1 and 2. Scale bar: 1 mm.

FIGURE 6. Colletes conradti Noskiewicz, male: a. pronotal spine; c. metasomal terga 1 and 2. Colletes wacki Kuhlmann, male: b. pronotal spine; d. metasomal terga 1 and 2. Scale bar: 1 mm.

FIGURE 7. Colletes conradti Noskiewicz, male: a. metasomal sternum 7 (dorsal view); c. gonostylus (lateral view). Colletes wacki Kuhlmann, male: b. metasomal sternum 7 (dorsal view); d. gonostylus (lateral view). Scale bar: 1 mm.

FIGURE 8. Distribution of Colletes conradti Noskiewicz and C. wacki Kuhlmann.