ART. 13 DESCEIPTIONS OF ICHNEUMON-FLIES CUSHMAN 21 



tegulae are yellow rather than piceous. The hind coxae vary from 

 entirely black to largely reddish piceous, while the abdomen beyond 

 the second tergite is normally largely and sometimes almost entirely 

 reddish. 



Genus CERATOGASTRA Ashmead 



Ceratosoma Ceesson, Proc. Ent. Soe. Phila., vol. 4, 1865, p. 281, 

 Ceratogastra Ashmead, Can. Ent., vol. 32, 1900, p. 368. 

 Ceratogaster Dauca Torre, Cat. Hym., 1901-1902, p. 62. 



In addition to the two species originally assigned to Ceratosoma^ 

 the following species have since been referred to the genus under 

 one or another of the three names : 



{{Exetastes^ Ceratosoma rufa [Pvovancher]) =D]/spetes rufus (Pro- 

 vancher). (New combination.) 



A homotype (by Gahan) of this species is in the National Collec- 

 tion and is the basis for its transfer to Dyspetes. The occiput is 

 not medially impressed as in the genotype, the impression being 

 represented only by a median angulation of the occipital carina ; and 

 the scutellar and propodeal carinae are stronger than in the geno- 

 type ; but I see no good reason for not referring it to Dyspetes. 



(Ceratosoma rubtjata Dayis) =Ceratogastrai ornata (Say). 



As pointed out by Cushman and Gahan,^* the type of rubyata is 

 a cyanide-stained specimen of Say's species. 



(Agathis ornata Sa.y)=Ceratogastra, ornata (Say). 

 (Agatliis polita 8aj)=Ceratogastra poUta (Say). 



Say's two species were transferred to the present genus by Cush- 

 man and Gahan, who also synonymized the genotype fasciata 

 (Cresson) with o'mata. 



This leaves three species in the genus: ornata (Say), polita (Say), 

 and apicalis (Cresson), to which is now added the following new 

 species. The four may be distinguished by the following key: 



1. Only tlie basal two tergites yellow at apex . polita (Say). 



At least the first three tergites yellow at apex 2 



2. Head behind eyes barely as broad as eyes ; wings strongly infumate at 



apex ; only first three tergites yellow at apex trif asciata, new species. 



Head behind eyes broader than eyes ; wings not distinctly infumate 

 at apex ; all tergites apically yellow ■ 3 



3. Front wings apically hyaline apicalis (Cresson). 



Front wings uniformly deeply yellowish ornata (Say). 



CERATOGASTRA TRIFASCIATA, new species 



Female. — Length 14 mm. ; antennae 8 mm. 



Temples barely as broad as eyes; face and frons of equal width; 

 eye nearly one-fifth longer than width of face; clypeus coarsely 



i*Proe. Ent. Soc. Wash., vol. 23, 1921, p. 154. 



