256 E. T. CRESSON. 



abdomen ferruginous, shining, basal half of first segment above, sometimes 

 a spot on the sides near apex, a spot on apex of second segment above, and 

 the remaining segments except base of third segment black. Length .50 — 

 .60 inch. 



Hah. — Nevada, (Morrison). Four specimens. This may prove to 

 be the % of occuJentalis or melleus. 



Aulacus firintis. — 9- — Black, thinly clothed with a short fine griseous 

 pubescent, more obvious on face; head subquadrate, broad but not long behind 

 eyes; face finely rugose, vertex and occiput feebly punctured; antennae en- 

 tirely black; mesothorax finely transversely wrinkled, middle lobe not gibbous, 

 broadly deeply emarginate centrally, and broadly rounded in profile; scutel- 

 lum wrinkled; wings hyaline, with a slight violaceous reflection, a square 

 violaceous black spot beneath stigma, not extending beneath second submar- 

 giual cell, a small fuliginous cloud at base of first discoidal cell and another 

 at extreme tip of wing; legs black, tibiae more or less tinged with fuscous, the 

 anterior pair pale in front; abdomen short, scarcely as long as thorax, petiole 

 very short, first, second and third segments ferruginous, Arith a large black 

 mark above; ovipositor as long as body. Length .55 inch. 

 H<th. — Colorado, (Prof. Snow). One specimen. 



Aulaciis niontanus. — 5*. — Black, thinly clothed with a short fine 

 griseous pile, more obvious on face: head quadrate, broad and prominent 

 behind eyes, face sparsely and finely punctured, 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, an irregular violaceous black cloud beneath stigma, extending beneath 

 second submarginal, extreme base of externo-median cell, and basal margin 

 of first 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 

 .64 inch. 



Hah. — Nevada, (Morrison). Two specimens. The anterior margin 

 of prothorax has a strong acute tooth on each side. 



Alllaeus pacificus. — 9. — Black; head long behind eyes, but narrowed 

 to posterior margin, face finely roughened, vertex and occiput smooth; mouth 

 sometimes more or less dull yellowish; antennae nearly as long as body, scape 

 sometimes dull yellowish beneath: mesothorax transversely aciculated, some- 

 times obsoletely so, middle lobe scarcely gibbous, rounded in profile, and 

 longitudinally grooved above anteriorly; tegulae dull yellowish; wings hya- 

 line, tinged with yellowish, a small fuliginous spot beneath stigma; legs pale 

 ferruginous, inclining to dull yellow, coxae and trochanters black, posterior 

 femora and tibiae sometimes more or less fuscous; abdomen about as long as 

 head and thorax, slender at base, polished, ferruginous, first segment at base, 

 a broad baud at tip, and disk of remaining segments more or less, black; 

 ovipositor longer than body. Length .50 — .55 inch. 



Hah. — Vancouver's Island, (Crotch). Four specimens. 



