170 HYMENOPTERA. 



maxillae and lingua, and the antennae reach-to the posterior coxae. 

 The maxillae are slender, not reaching to the tip of the labium. 



The female usually provisions her cells (Plate 5, Fig. 14) with 

 spiders. The cells are constructed of layers of mud of unequal 

 length, and formed of little pellets placed in two rows, and di- 

 verging from the middle. They are a little over an inch long, 

 and from a half to three-quarters of an inch wide, and are some- 

 what three-sided, the inner side next the object, either stone- 

 walls or rafters, to which it is attached, being flat. As the 

 earthen cells sufficiently protect the delicate larvae within, the 

 cocoons are very thin, and brown in color. 



The cells of Pelopwus flavipes from Brownville, Texas, col- 

 lected by an United States officer and presented to the Boston 

 Society of Natural History, contained both spiders and numer- 

 ous pupae of a fly, Sarcopliaga nudipennis Loew (MS) which is 

 somewhat allied to Tachina. These last hatched out in mid- 

 summer a few days before the specimens of Pelopaeus. It is 

 most probable that they were parasitic on the latter. These 

 specimens of P. flavipes were more highly ornamented with yel- 

 low than in those found northwards in the Atlantic States, 

 the metathorax being crossed by a broad yellow band. 



The genus Ammophila is a long slender form, with a petio- 

 late abdomen, the tip of which is often red. The petiole of the 

 abdomen is two-jointed, and very long and slender, being 

 longer than the fusiform part. In the males the petiole is in 

 some species much shorter. The wings are small, with the apex 

 more obtuse than usual ; the second subcostal cell is pentag- 

 onal, and the third is broadly triangular. 



Westwood states that "the species inhabit sandy districts, 

 in which A. sabulosa forms its burrow, using its jaws in bur- 

 rowing ; and when they are loaded, it ascends backwards to 

 the mouth, turns quickly around, flies to about a foot's distance, 

 gives a sudden turn, throwing the sand in a complete shower 

 to about six inches' distance, and again alights at the mouth 

 of its burrow." 



' ' Latreille states that this species provisions its cells with 

 caterpillars, but Mr. Shuckard states that he has observed the 

 female dragging a veiy large inflated spider up the nearly per- 

 pendicular side of a sand-bank, at least twenty feet high, and 



