G. C. DAVIS. 273 



Face and mesonotuni without yellow markings Ciilf iroriniN n. sp. 



Face yellow; abdomen with median transverse black bands ; uiandil)l('S with- 

 out distinct teeth erodeiis n. sp. 



Otobla!«tiis bideiis n. sp. 



% . — 5 mm. Black, with face, scape beneath, mouth-parts, cheeks, prothorax 

 except dorsum, mesosternum, lower pleurse, tegulaj, cuneiform line on margins 

 of mesonotum, scutellums except central dot on the mesothorax. coxte, trochan- 

 ters aiid central annulus on hind tibiae, yellowish white; remainder of legs pale 

 honey-yellow except hind tibise. which are dusky: wings hyaline, iridescent, 

 nervures and stigma yellowish brown ; head and mesothorax broad. 



Two specimens from Agricultural College, Michigan (type, coll. 

 G. C. D. and College). 



Otoblai§ttiM coiupresNiveiitri!^ Cress. (Tnjphon), Tr. Am. E. S. ii, 105. 



9 . — 5 mm. Head and thorax black, with median spot on face, clypeus, mouth- 

 parts, tegulse, spot in front, spot beneath primary and secondary wings, triangular 

 spot on margins of mesonotum, four anterior coxse and trochanters, lemon-yellow ; 

 remainder of legs honey-yellow ; abdomen rufous, black on two or three apical 

 segments and on most of basal; antenn£e brownish red; wings hyaline; ovipositor 

 exserted, straight ; abdomen strongly compressed toward apex. 



% . — The single specimen, which pi-obably belongs to this species, diifers in 

 having the entire face, antennae beneath, spot on cheeks beneath and stripe on 

 anterior mesopleurse. yellow; abdomen piceous, reddish on segments 2 and 3; 

 posterior coxae black, yellow at apex. 



Six specimens from Massachusetts, Canada, Colorado and South 

 Haven, Mich, (types, coll. Amer. Ent. Soc). 



OtoblaKttis niiuiiniis Cress. (Tri/phon), Proc. Ent. Soc. Phil. iii. 281. 



9. — 3.5 mm. Differs from compressivenfris in being smaller, in having the ab- 

 domen scarcely compressed, in having the hind coxae yellow and the abdomen 

 except the third segment piceous. 



Type from Illinois ; coll. Amer. Ent. Soc. 



Otoblastu»$ ciiltiforiniK n. sp. 



9. — 6 mm. Head and thorax black, abdomen piceous, with apical half of seg- 

 ment 2 and narrow apical margin of 3, rufous ; legs rufous ; elypeus, mouth-parts, 

 tegulte and point in fi-ont, yellow ; antennae brown ; wings hyaline, cubito-dis- 

 coidal vein broken ; metathorax with apical median area large and with distinct 

 median carina. 



One specimen from Colorado (type, coll. Amer. Ent. Soc). 



Otoblastus erode lis n. sp. 



% 9. — 5 mm. Black; face, anterior orbital lines, antennse beneath, mouth-parts, 

 tegulae, spot in front and beneath, lateral inargins of mesonotum, anterior and 

 posterior margins of mesopleurae, trochanters and four anterior coxte pale yellow ; 

 the % has the spots more largely developed, and in addition has the pectus, ster- 

 num and posterior coxae yellow ; abdomen piceous to black, with segments 3 and 

 4 rufous, or yellowish red, with median, transverse, dusky hands; apex of seg- 

 ments 2 and 4 rufous, thyridia rufous; legs honey-yellow, jiosterior coxae of 9 

 black and yellow; wings large and hyaline, nervures and stigma brown ; mandi- 

 bles without distinct teeth ; abdomen subconi pressed, elongate. 



TRANS. AM. ENT. SOC. XXIV. (35) SEPTEMBKK, 1897. 



