a. c. DAVIS. 277 



TREMATOPYGUS Holmgreu. 

 (Mon. Tryplionidum Suecite 179, 1856.) 

 Body rather broad and short, pilose, polished, and finely pnnc- 

 tured ; head transverse; ftice flat, slightly swollen beneath antenna?; 

 clypeus flat, usually rounded at apex. Thorax broad ; para]«idal 

 grooves more or less indicated ; nietathorax completely areolated and 

 usually scabrous; scutellum small, oval. Abdomen thickset and 

 broadly oval ; ovipositor short, petiole broad, with carinte usually 

 on basal portion. Legs strong, femora slightly iucrassate. Wings 

 with triangular areolet ; second recurrent nervure but slightly bent; 

 humeral cross-vein of hind wing broken below the middle. 



Wings fuscous ; abdomen nifous fusciilosiis n. sp. 



Wings hyliue, or subhyaliiie. 



Abdomen black ; clypeus depressed at apex rotiiinlatus n. sp. 



Abdomen in part rufous ; clypeus not depressed at apex. 



Posterior tibise white, black at apex signal ipefS Cress. 



Posterior tibia- rufous, dusky at apex snitellatiis Ashm. 



Treniatopygiis f'iis<'ulosiis n. sp. 



%. — 5 mm.: antennte 4.5 mm. Black, with abdomen and legs rufous; poste- 

 rior coxfe and base of petiole somewhat black; four anterior coxse, trochanters, 

 mandibles, palpi and tegulie whitish; wings fuscous, iridescent, broad at apex; 

 nervures and stigma brown; stigma thick, triangular ; transverse median ner- 

 vure unites back of basal ; cubito-discoidal nervure strongly arched ; head and 

 thorax polished, finely punctured ; mesonotum with a median depression ; cariniB 

 on petiole of abdomen reach nearly to apex. 



Three specimens from Agricultural College, Michigan ; taken 

 June 25th (types, College and Davis collections). 



Trematopygiis roliiiMlatus n. sp. 



9 "J, . — 5 mm. Black, with clypeus, mouth-parts, scape beneath, tegulse, spot 

 in front, trochanters, four anterior coxse and venter, except at apex, yellow; legs 

 pale rufous, with coxte, tarsi and apex of tibise of hind legs dusky; wings hya- 

 line, nervures and stigma brown ; stigma thick, deep, and rounded in inner mar- 

 gin ; areolet minute, petiolate ; transverse median nervure unites back of basal ; 

 face strongly pilose and coarsely shagreened ; clypeus transverse, depressed at 

 apex: thorax polished, mesonotum coarsely shagreened and subopaque, parapsidal 

 grooves widely separated and not uniting; abdomen polished: carinje ou petiole 

 in % strong, in 9 f^iiiit: petiole curved above. 



Two specimens. New Hampshire and Agricultural College, Mich- 

 igan, June 13th (types, coll. College and Am. Ent. Soc). 



Trematopygiis signatipes Cress. (Tryphon), Tr. Am. Ent. Soc. ii, 105. 



9 . — 5 mm. Black ; clypeus, two spots above and mouth-parts, yellowish wliite ; 

 tegulse, four anterior tarsi and tibial spurs and basal two-thirds of hind tibije, 

 white; tarsi, apex of femora and apical third of tibise on hind legs, black; re- 

 mainder of legs and -second abdominal segment rufous: wings hyaline, iridescent, 

 nervures and stigma broadly lanceolate; areolet petiolate; basal and transverse 



TRANS. AM. ENT. .SOC. XXIV. SEPTEMBER, 1897. 



