AMERICAN HYMENOPTERA. 49 



B. Wings with one marginal and three submarginal cells. 



First aud second submarginal cells each with oue recurrent ncrvure. 



9. THULEA, Say. 

 Thulca, Say, Bost. Jour. I, 18.35, 21.3. 



Win(/s. — Oue marginal and three submarginal cells. 



AntenniB 6-jointed, the sixth clavate ; second twice as long as first 

 and second; fourth minute, shortest; fifth as long as third; sixth 

 nearly as long as third and fifth, slightly dilated at tip. 



Scutcl large. 



1. T. nigra. 



Thulca nigra, Say, Bost. Jour. I, 18.35, 213. 



" Body black; nasus and labrum green; spot before the wings, wing 

 scale and feet yellowish green. 



" Length to the tip of the wings, three-twentieths of an inch. 



^'Inhabits Mexico." 



Not seen. 



10. ACOEDULECERA, Say. 

 Acordulecera, Say, Bost. Jour., I, 1835, 21U. 



Whitjs — One marginal and three submarginal cells; first and second 

 submarginal each with a recurrent nervure; first submarginal long; 

 lanceolate cell wanting. Stigma large, as in Hi/lvtuma. 



Under-wing with one inner cell. It has but one marginal, two sub- 

 marginal, one discoidal and two medial cells, and the externo-medial 

 nerve joins the costa without bending, leaving the marginal cell with 

 an acute angle behind. 



Antennse, six articulate, very short, not clavate, apical joint not en- 

 larged, but somewhat globose. 



Bo(Jj/ short and stout, maxillary palpi having the three apical joints 

 long, the sixth longest. 



Legs short ; the four posterior tibiae with a side spur, as in Hylio- 

 toma^i apical spurs all sharp, claws simple. 



This genus would seem to require a separate division, as its anten- 

 nae are filiform and not clavate, and its afl[inities are rather toward the 

 Hylotomides or Tenthredinides. 



1. A. dorsalis. 



Acordulecera dorsalis, Say, Bost. Jour. I, 1835, 200. 9 % . 

 "Black: hyjiostoma, a spot at base of the tergum and feet whithish." Length 

 0.12—0.16. Br. wings 0.36—0.48 in. 



'' S 9 . Black, with minute whitish hairs ; nasus, labrum and mouth 

 white; mandibles rufous at tip; thorax, with the anterior segment, 

 curving to the base of the wing, white ; line of the insertion of the 

 wings white; wings a little dusky; nervures fuscous; tergum pale 



TRANS. AMER. ENT. SOC. ( 7 ) JUNE, 1867. 



