Agrilus addendus Crotch, 1873

Hespenheide, Henry A., 2007, The identity of Agrilus impexus Horn, a new species, and taxonomic notes and records for other Agrilus Curtis species (Coleoptera: Buprestidae), Zootaxa 1617 (1), pp. 57-66 : 63-64

Agrilus addendus Crotch

( Fig. 3 )

Agrilus addendus Crotch, 1873: 95 ; Horn 1891: 329–330; Fisher 1928: 267–270

Agrilus frisoni Fisher, 1943: 201 ; MacRae and Nelson 2003: 61 new snonymy

Diagnosis. As Agrilus paraimpexus , but pronotum with disk more regularly convex on anterior ½, depressed only very slightly along midline on basal ½, lateral margins shallowly arcuately rounded; elytra with spots of setae in sutural depression indistinct and usually inconspicuous, basal and median spots often connected, api- cal spots often elongate, not distinct. Genitalia as in Fig. 3 .

Distribution: Texas to Veracruz, México.

Specimens examined. Texas: [Texas, Belfrage] “221.//J.L. Leconte/Coll.//Type 5079//addendus/Cr.,” (Lectotype, MCZ); “Tex//addendus/Cr.//Horn Coll/H4737” Lectoallotype (MCZ); “Tex//4737//Type No 56659 USNM// Agrilus frisoni Fisher ” (USNM). Brownsville, 22.05.1935, J.N. Knull (7, NMPC, CHAH); Davis Mts., 24.06.1956, D.J.&J.N. Knull (RLWE); Del Rio, 25– 26.04.1959, Becker & Howden, beating Acacia sp. (1, CHAH); Rocksprings, 25.04.1959, Becker & Howden (1, CHAH); Blanco Co., 8 mi S Sandy, 03.05.1988, W.F. Barr (2, WFBC); Coke Co., 3 mi SE Bronte, 30.03.1972, C.W. O’Brien (1, RLWE); Dimmit Co., 7 mi N Carrizo Springs, 29.03.1972, C.W. O’Brien (1, RLWE); Kenedy Co., 49 mi N Raymondville, 30.06.1961, R.L. Westcott (5, RLWE); Kimble Co., Segovia, 12.04.1996, C.L. & S.L. Staines, taken on mesquite (1, CHAH); Pecos Co., Fort Stockton, 30.08.2003, C.W. & L.B. O’Brien (1, CLBC); Sutton Co., 8 mi SW Roosevelt, 18.04.1976, F.T. Hovore (1, RLWE), R. Penrose (6, RLWE); Upton Co., 9 mi SW Rankin, 26.03.1972, C.W. O’Brien & Marshall (1, RLWE); 25.03.1972, C.W. O’Brien & Marshall, night (3, RLWE); Uvalde Co., Garner St. Pk., 14.06.1983, B.K. Dozier (1, CHAH), Speir Rch., 3 mi NW Uvalde, 1– 7.05.1977, T. Eichlin, M. Wasbauer (2, RLWE), 1.05.1977, Malaise trap 10A-5P (1, RLWE), 4.05.1977, Malaise trap 9A-5P (1, RLWE), 6.05.1977, Malaise trap 10A-6P (1, RLWE), 7.05.1977, beating vegetation (1, RLWE); 15.4 mi W Cline, 3.07.1972, R.L. Westcott (5, RLWE). Mexico: Nuevo Leon, 29 km W Linares on #60 Santa Rosa Canyon, 2400’, 3.06.1983, R. Anderson, dry oak forest (1, RLWE); Tamaulipas, Nacimiento del Rio Frio, 5 mi S Gomez Farias, 400’, 5-6.061983, R. Anderson, tropical decid. forest (1, RLWE); Hwy 101, 11 mi SW Cd Victoria 4000’, 22.07.1982, O’Brien & Wibmer (1, CLBC); Hwy 101, 81 mi NW Cd Victoria 1250’, 21.07.1982, O’Brien & Wibmer (1, CLBC); Veracruz, 45 mi S Tampico, Moldenke, from Myrmecodendron [= Acacia ] (1, CHAH); [ Mexico], 20.03.1943, with lettuce, Laredo, No.31677, Lot No 43-2577 (1, USNM).

Discussion. This species is very close to A. paraimpexus in morphology and shares mesquite ( Prosopis spp. ) as an adult host, but is allopatrically distributed and morphologically distinct as given in the diagnosis and as discussed under A. paraimpexus . There are two specimens in the Museum of Comparative Zoology labeled as “Cotypes” of A. addendus . Fisher (1928:269) clearly considered Cotype 1 to be the type of A. addendus (“Redescribed from the male cotype No. 1 in the Museum of Comparative Zoology”) although he did not formally designate it to be the lectotype. Fisher also wrote (1928: 270): “The two cotypes in the LeConte and Horn collections were both collected by Belfrage in Texas. Specimen No. 2 in the LeConte collection labeled “ addendus Cr. Type 5079-2” is A. abjectus Horn , and not A. addendus .” On the preceding page Fisher (1928: 269) also says his description of the female of A. addendus was made from “the female cotype No. H- 4737 in the Philadelphia Academy of Natural Sciences.” The Horn collection is also now at the Museum of Comparative Zoology and there are five specimens labeled H-4737 (labeled “Tex” or “S.W. Tex”), only one of which also bears the label “addendus/Cr.,” apparently in the same hand as Cotype 1, and it is a female. Although Fisher refers to these specimens as cotypes, the specimens themselves are not so labeled, and Crotch’s description gives male characters, but does not specify the number of specimens or refer to a female. Interestingly, Horn’s (1891) treatment of A. addendus listed Texas and Arizona as the species’ range. Under “Variations,” Horn writes that “two forms may be separated in this species, those with the pubescent spots well marked and those without them. The former variety shows some pubescence at the sides of the thorax and at the sides of the last three ventral segments.” From this it seems clear that Horn is referring to A. paraimpexus and A. addendus , respectively, and that he recognized both the close relationship and the consistent differences between A. addendus and A. paraimpexus . Interestingly, the unique male type of Fisher’s Agrilus frisoni also has a penciled label with the number 4737 and may have come from the same series from which A. addendus was described. It differs from A. addendus only in the deep medial depression of the pronotum, which seems to be an individual deformity in that it is not perfectly bilaterally symmetrical. The only non-catalogue reference to A. frisoni since its description is apparently that of MacRae and Nelson (2003) which listed distributional records without comment. Specimens in that paper probably include both A. addendus (Tamaulipas) and A. paraimpexus (Puebla, Sinaloa), with the Chihuahua record uncertain as to which. Males from Texas measure 4.10–6.10 mm long (mean = 5.28 mm for 27 specimens), and females measure 4.40–6.20 mm long (mean = 5.34 mm for 23 specimens).

Figures

FIGURES 1–5. 1–3, Genitalia of male Agrilus: 1. A. impexus (New Mexico, Jemez Springs, CASC); 2. A. paraimpexus (Holotype); 3. A. addendus (Texas, Rocksprings, CHAH), scale bar indicates 1.0 mm; 4–5, Agrilus funestus Chevrolat: 4. dorsal habitus and lateral habitus (Texas specimen), scale bar indicates 2.0 mm; 5. genitalia of male (specimen from Mexico, Chiapas, 2 mi NNW Pueblo Nuevo, LLU Biol. Sta., 12.07.1965, G.H. Nelson, FSCA), scale bar indicates 1.0 mm.