534 August Schletterer. 



vertex, occiput and cheeks smooth and polished; antennae as long as head and thorax, 

 entirely black; thorax above coarsely, transversely wrinkled, middle lobe of mesothorax 

 gibbous, subpyramidal in profile, emarginate centrally, anterior margin of prothorax 

 with a strong acute tooth; wings hyaline slightly tinged with fuscous, and iregular viola- 

 ceous black cloud beneath stigma, extending beneath second submarginal, extreme base 

 of externo-median cell, and basal margin of flrst discoidal also with a blackish cloud; 

 legs entirely black, posterior coxae transversely aciculated; abdomen as long as head and 

 thorax, polished, slender at base, ferruginous, base of first segment, and disk above, and 

 the two or three apical segments black; ovipositor scarcely as long as body. Length. 

 54 inch. 



Hab. Nevada. Two specimens. The anterior margin of prothorax has a short acute 

 tooth on each side.« Cress. 



Subreg. 1 et 2 (et 4). 



Nevada, Colorado, Rocky Mountains. 



A. montanus scheint dem maculatus und den damit nächst verwandten Arten etwas 

 näher zu stehen, worauf die Zahnfortsätze des Vorderrückens hindeuten, ist aber, wie 

 ich aus Cresson's Bemerkung über die Gestalt des mittleren Abschnittes des Mittel- 

 rückens schliesse, jedenfalls von diesen südamerikanischen Arten verschieden. 



Aulacus minor Cress. 



Aulacus minor Cress., Trans. Amer. Soc. Philad., T. VIII, Proc, p. VI, <$ , 9 1880 



»9. Small, black, head smooth and polished, broad behind eyes; antennae as long 

 as head and thorax, scape beneath dull red; thorax above transversely wrinkled, the 

 mesothorax gibbous in front, anterior lobe emarginate medially as in abdominalis; tegulae 

 piceous; wings hyaline, slightly dusky at tips, nervures and stigma black; legs mostlv 

 ferruginous, coxae, trochanters and posterior tibiae black, sometimesthe posterior legs are 

 almost entirely fuscous or black; abdomen as long as head and thorax; ferruginous, 

 shining, base of first and two or three apical segments black; ovipositor as long as body. 

 Length 3o inch. 



(j. Abdomen mostly black, the sides of the first, second and third segment more 

 or less ferruginous. Length. 3o inch.« Cress. 



Subreg. 1 et 2. 



Nevada. 



Aulacus pallipes Cress. 



Aulacus pallipes Cress., Trans. Amer. Ent. Soc. Philad., T. VII, Proc, p. XVII, <j* .... 1879 

 Aulacus pallipes Cress., Proc. Acad. Nat. Hist. Philad., p. 4, $ 1879 



»d\ Small, black; head subglobose, broad behind eyes; face beneath antennae, spot 

 beneath eyes, mandibles except tips, antennae and legs except coxae, vellow; antennae 

 nearly as long as the body, dusky atbase above; mesothorax very feeblv rugose, rounded 

 in front, not emarginate, sides of pleura stained with dull vellowish; wings hvaline, ner- 

 vures and stigma dull ochraceous; abdomen robust, about as long as head and thorax, 

 slender at base, first and second segments except base, and the venter, ferruginous. 

 Length 26 inch.« Cress. 



Subreg. 3. 



Massachusetts. 



