HYMENOPTERA. 263 



triangular, plane above, prolonged into a point at the extremity, in 

 the females, and usually dcntated in the males. 



These Inseets approach the Megachiles, whilst the Stelides are con- 

 nected with the Anthidia *. 



Other Apiarise, the Cuculince, similar to the preceding ones in 

 their posterior tarsi, and in which, as in the latter subgenera, the 

 labial palpi have the form of squamous seta?, and the abdomen is 

 destitute of a brush in both sexes, that are parasitical, like the Cceli- 

 oxydes and Stelides, sometimes almost glabrous and similar in co- 

 lour to Wasps, and sometimes pilose in patches, have an elongated 

 and truncated, or short and almost semicircular labrum, and narrow, 

 pointed mandibles, unidentated at most on the inner side. The pa- 

 raglossse are frequently long, narrow, and setaceous. The scutellum 

 in several is emarginate or bidentated ; in others it is tuberculous. 

 They are the Nomadce of Fabricius. Several of these Insects ap- 

 pear early in the spring, flitting near the earth or about walls ex- 

 posed to the sun, in order to deposit their eggs in the nests of other 

 Apiarise. It is this habit, analogous to that of the Cuckoo, which 

 induced me to name them Cuculinee. 



In some, almost always glabrous, the paraglossse are much shorter 

 than the labial palpi. 



Sometimes the labrum forms an elongated triangle, truncated at 

 the end, and inclined above the mandibles. There are never more 

 than two complete cubital cells. 



Ammobates, Lat., 

 Where the maxillary palpi are formed of six joints f. 

 Phileremus, Lat. — Epeolus, Fab., 

 Where these organs have but two joints J. 



Sometimes the labrum is short, and almost semicircular or semi- 

 oval. 



Epeolus, Lat., Fab. 

 Three complete cubital cells, and the maxillary palpi uniarticu- 

 lated §. 



NoMADA, Fab. 

 The same number of cubital cells, but the maxillary palpi are formed 

 of six joints ||. 



Pasites, Jur. — NoMADA, Fab. 

 But two complete cubital cells. Their maxillary palpi are quadri- 

 articulated ^. 



The other Cuculinse, in which the body is densely pilose in patches, 

 the scutellum is often spinous, and where there are always three 

 complete cubital ceils, are removed from the preceding Apiarise, and 



* Lat. Gener. Crust, et Insect., IV, 166. 



t Lat. Ibid., 169. 



X Lat., Ibid., Idem. 



§ Lat., Ibid., 171. 



II Lat., Ibid., 169. 



•j Lat., Ibid., 170. 



