AMERICAN HYMENOPTERA. 83 



white, with the mouth dark and the usual eye spots. Length about 

 0.15 inch. 



April 2. One larva was cut out of a gall gathered the preceding Au- 

 gust, showing that some larvfe undergo their transformation in the 

 gall, and do not go into the pupa state until spring. 



Div. 2.— INQUILINES or Guest-flies. 



4. E. perturbans. 



Eimra perturbans, Walsh, Proc. Ent. Soc. Phil, vi, 186C, 254. 

 9 . Differs from the gall-making E. s. ovum 9 only by the dorsum 

 of the abdomen varying from honey-yellow, including the lateral plates, 

 through obfuscated to deep black, with the lateral plates also black. 

 The % does not differ in any respect from E. s. ovum % . 



Two % , five 9 . One % bred April 7, from the Cecidomyidous gall 



5. strohlloides, 0. S. 



One S , two 9 , bred May 7 — 22, from the Cecidomyidous gall S. 

 batatas, Walsh. 



One 9 , bred May 16, from the Cecidomyidous gall *S'. rhodoides, 

 Two 9 , bred from an undescribed Cecidomyidous bud-gall Vitis fu- 



sus, Walsh, composed of bunches of 6 — 50 fusiform galls on the stem 



of the wild grape-vine. 



Hartig divides his sub-genus Cri/ptocampns into two sections, of 



which the second, Diphadnus, resembles the above, except that it has 



but two submarginal cells, the first receiving the recurrent nervures. 



Lanceolate cell petiolate; 

 Posterior tibise much flattened. 



29. CR.ffiSUS, Leach. 

 Croesus and Nematus, Div. 1, Leach. 

 'Nematus, Sec. 2, I, Hartig, Die Blattw. 184. 

 Nematus, fff, Lepel. Mon. Tenth. 62. 



Wings with one marginal and four submarginal cells ; the second 

 long, receiving two recurrent nervures ; first and third small, lance- 

 olate cell petiolate. Four submarginal bullae, one in each of the tran.s- 

 verse nervures, long one on the submarginal nervures, beginning at the ' 

 first recurrent nervure ; under wings two middle cells. 



Legs. — The four anterior legs simple; the posterior pair rather 

 stout, their tibiae dilated at apex ; the basal joint of tarsi longest, much 

 dilated and flattened ; remaining joints small and simple. 



