Ancistrocerus isla Carpenter

Genaro, Julio A., 2011, Vespidae (Insecta: Hymenoptera) of Puerto Rico, West Indies, Insecta Mundi 2011 (202), pp. 1-35: 6-7

publication ID


persistent identifier

treatment provided by


scientific name

Ancistrocerus isla Carpenter

new species

Ancistrocerus isla Carpenter   , new species

( Fig. 25 View Figures 25-31 �26, 41)

DIAGNOSIS. Like A. cingulatus   , and unlike other American Ancistrocerus   , by having the punctation fine on the humeri and scutum, and nearly absent on metasoma; the metasomal pubescence is very reduced; the humeral angles are blunt; and the second metasomal sternum has a short longtitudinal basomedian furrow. The two species are separated by metasomal terga I-II shiny, with superficial punctures, ap� pearing almost impunctate in A. isla   n. sp., while metasomal terga I-II are dull, with fine punctation in A. cingulatus   . The transverse carina on the first metasomal tergum is blunt and thick in A. isla   n. sp. ( Fig. 26 View Figures 25-31 ), while it is sharp and thin in A. cingulatus   .

DESCRIPTION. Female: holotype forewing length 9.6 mm. Structure � clypeus shallowly emarginate api� cally; vertex lacking tubercles; tempora not projecting; gena narrower than eye below emargination; pronotal carina absent;humeral angles blunt; humeri and scutum with punctation fine; scutum slightly longer than wide, not noticeably flattened posteriorly; notauli obliterated anteriorly; parategula narrow, weakly hooked; propodeum with lateral angles weakly pointed and concavity enclosed by low carinae, sides and concavity punctate; metasomal tergum I with transverse carina blunt, thick, well developed dorsally, tergum I crenate behind carina; terga I-II shiny, with superficial punctures, appearing almost impunctate, tergum II crenate basally, with few, sparse, superficial punctures apically; terga II-III not reflexed apically; metasomal sternum II lacking basomedian furrow, in lateral view evenly convex posterior to transverse furrow, with short longtitudinal basomedian furrow.

Color � black; yellow are most of clypeus except for rim, interantennal spot, antenna internally and most of base of scape, small spot on tempora, pronotum dorsally, parategula, tegula anteriorly and posteriorly, large mesepisternal spot dorsally, most of scutellum and metanotum, femora apically and most of tibiae, most of dorsal surface of metasomal tergum I, apical fascia on tergum and sternum II; wings hyaline, forewing narrowly infuscate anteriorly, veins and pterostigma brown.

Vestiture � abundant setae on head and mesosoma, longer than an ocellus diameter; reduced, sparse setae on metasoma.

Male: unknown.

DISTRIBUTION. Known only from Puerto Rico. The holotype and one paratype were collected in a trap (for fruit flies?), while the label of the other paratypes, Río Abajo, could refer to a number of places in Puerto Rico.

TYPE MATERIAL. ♀ holotype Puerto Rico: Mayaguez, trap, 17 May 1937, San Juan No 6860, Lot no. 37-16754 [deposited in USNM]. Paratypes: ♀ same label data [ AMNH]   ; 3 ♀♀ Río Abajo , 3 June 1985 (J. Torres), #67 [ LACM]   .

ETYMOLOGY. From the Spanish word for island, to be treated as a noun in apposition.


Smithsonian Institution, National Museum of Natural History


American Museum of Natural History


Natural History Museum of Los Angeles County