﻿114 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOo 



KEY TO THE NEARCTIC SPECIES OF AULACUS 



1. Top of head without wrinkles; back of head without wrinkles in position of 



occipital carina; hind coxa of female without a projecting ventral lobe; first 



sternite of female not cleft; parasites of Coleoptera 2 



Top of head anteriorly with transverse wrinkles; back of head with concentric 

 wrinkles in position of occipital carina; hind coxa of female with a ventral 

 lobe projecting well beyond trochanter socket; first sternite of female cleft 

 more than halfway to base ; parasites of Xiphydria 3 



2. Forewing with an apical dark spot; frons coarsely punctate; head and thorax 



ferruginous 1. dispilus, new species 



Forewing without an apical dark spot; frons very finely punctate; head and 

 thorax black 2. brevicaudus Cushman 



3. Reticulate or transverse wrinkling of frons extending almost to median ocellus; 



sides of pronotum with some coarse rugosities in addition to finer rugosities 

 and some punctation; apical part of abdomen usually black; temple often 



black 3. pallipes Cresson 



Reticulate or transverse wrinkling of frons confined mostly to its anterior 

 portion, rarely extending close to median ocellus; sides of pronotum punc- 

 tate and partly finely rugose; apical part of abdomen pale, rarely blackish; 

 temple pale 4 



4. Apical process of female hind coxa more than 1.4 as long as wide; mesoscutum 



black; sculpture on upper part of frons more or less as in figure 16, m. 



5. digitalis, new species 



Apical process of female hind coxa less than 1.4 as long as wide; mesoscutum 



usually pale; sculpture on upper part of frons more or less as in figure 16, 



I, n 5 



5. Hind femur about 5.0 as long as wide; frons smoother and more distinctly 



punctate, without an anterior fine longitudinal wrinkle or group of wrinkles 

 (fig. 16, I); second cubital cell receiving the second recurrent vein usually 

 well beyond its middle; ovipositor sheath about 0.5 as long as forewing. 



4. lovei Ashmead 

 Hind femur about 6.0 as long as wide; frons averaging more wrinkled and less 

 distinctly punctate, usually with an anterior median fine longitudinal 

 wrinkle, or group of wrinkles (fig. 16, n) ; second cubital cell receiving the 

 second recurrent vein at or a little beyond its middle; ovipositor sheath 

 about 0.74 as long as the forewing 6. burquei Provancher 



1. AULACUS DISPILUS, new species 



Forewing with an apical dark spot. 



Type female: Forewing 5.3 mm. long; frons with coarse, rather close 

 punctures; top of head with coarse, rather distant punctures; inner 

 side of hind coxa w4th an oblique channel ending below on a prom- 

 inence which is a little beyond the midlength of the coxa; ovipositor 

 sheath 1.1 as long as the forewing. 



Ferruginous. Flagellum blackish; pronotum brown; coxae, basal 

 trochanters, hind femur, thoracic sterna, lower part of metapleurum 

 and blotches behind the bases of the wings and on the propodeum 

 below the attachment of the abdomen dark brown; second trochanters 

 and fore and middle femora basally more or less light brown; hind 

 tibia brown, its basal 0.25 stramineous; forewing dark brown beyond 



