G. C. DAVIS. 265 



9 . —What is perhaps the female of this species is rufous where the % is yel- 

 lowish on the sternum, pleurse, mouth-parts and anterior legs ; the face and cheeks 

 are black ; the tegulse, point in front and line on margins of mesonotum ai'e yel- 

 low and as in the % ; vhe abdomen is also marked the same ; the areolet is 

 slightly smaller and the head not quite as large, otherwise as in the % . 



One male from Algonquin, 111., collected by Dr. Nason, after 

 whom I take pleasure in naming the species, and one female from 

 Montana (type, coll. G. C. D. and Amer. Ent. Soc). 



liiithrolestes siiiiilis n. sp. 



9. — 5 mm. Head and notum of thorax black; abdomen and metathorax 

 black with a rufous tinge; pleurse and sternum piceous with paler spots; tegulfe, 

 spot before and palpi yellow; clypeus and mandibles rufous; legs ferruginous : 

 antennse brown ; wings hyaline, the tegulse and areolet are quite as large as in 

 the preceding species; the parapsidal grooves are very distinct and blend into a 

 broad depression on disc of mesonotum. 



One specimen from Colorado (Prof. C. P. Gillette). Type, coll. 

 G. C. D. 



Trilte TRYPHONINI. 



1. Eyes plainly concave between antennie '■ Ecclinops Foer. 



Eyes not concave between antenna? 2. 



2. First segment of abdomen broadened ear-shaped at base on each side. 



Otoblastus Foer. 

 First segment not or scarcely broadened ear-shaped at base on sides 3. 



3. Wings with an areolet 4. 



Wings without an areolet, or with an incomplete one til. 



4. Cubito-discoidal nervure broken with a tooth-like projection ; metapleura 



projecting tooth-like immediately above the hind coxse. 



■ Protarclms P^)er. 



Cubito-discoidal nervure rarely broken ; metapleune not jirojecting tooth-like 



above hind coxae 5. 



5. Areolet large, quite regular and almost rhombic 6. 



Areolet very irregular, oblique, not rhombic 7. 



6. Segments 2 and 3 of abdomen with oblique impressions. -''Dyspetes Foer. 

 Segments 2 and 3 without oblique impressions Rliiiiiplialea Foer. 



7. Second abdominal segment without thyridia (small glabrous spots or depres- 



sions) at base 8. 



Second segment with distinct thyridia at base 23. 



8. Second abdominal segment with a sharp ridge at base which extends to the 



spiracles Ery ma Foer. 



Second segment without ridge to spiracles. • • 9. 



9. Metanotum without areolets 10. 



Metanotum more or less areolated 12. 



10. Spiracles of first abdominal segment somewhat projecting; no ridge extends 



from them to the apex .* 1] . 



Spiracles of first abdominal segment not projecting, and a sharp ridge extends 

 from them to a])ex Erigloea Foer. 



TRANS. AM. ENT. SOC. XXIV. (34) SEPTEMBER, 1897. 



