32 E. T. CRESSON. 



rather sharp, black teeth and near apex a smaller blunt one, beyond which are 

 two or three minute serratures not distinctly defined ; posterior tibiae yellow 

 posteriorly ; abdomen short, subglobose, narrowed at base, extreme base smooth 

 and rufo-piceous; a narrow band near base, two broader approximate bands, 

 sometimes confluent, near apex, and a lunate spot at apex surmounting an ob- 

 long smooth depressed space, yellow. Length .30 inch. 



Uab. — Texas. (Belfrage.) Two specimens. This has a remarka- 

 bly short, robust form, different from that of any of tbe other species, 

 and approaching more nearly to that of Sumichrastvi, although quite 

 different. The very large, almost circular, posterior femora, with only 

 four distinct teeth, three of which are long, slender and acute, readily 

 distinguish it from auy other North American species. 



6. Leucospis Poeyi. 



Leucospis Poeyi, Guer. Icon. Beg. Anim. iii, p. 414. LaSagra, Hist. Cuba, pi. 

 18, fig. 4. 



Uab. — Cuba. (Poey.) Two % 9 specimens. Readily distinguished 

 from all the other N. A. species by the broad, heavy yellow markings. 

 The form of both sexes is similar to that of ujftnis, to which it is allied 

 also in ornamentation, although much slighter in the latter species. 

 The prothorax is broadly margined, laterally and posteriorly, with yel- 

 low, leaving anteriorly a large semi-circular black mark, bicolored — 

 reddish and black — in 9 ; the scutellum is yellow except narrow basal 

 margin ; the metathorax, a large mark on posterior margin of pleura 

 and also a line over tegulae, are also yellow; tegulas fulvous; wings 

 yellow, tipped with dusky ; legs yellow, with ferruginous coxae tipped 

 beneath with yellow; posterior femora fuscous, reddish above and 

 rather broadly yellow at base and apex ; abdomen ferruginous at apex, 

 with a yellow streak on each side of ovipositor, a broad yellow band at 

 apex of first segment and another on the third, the second with a small 

 lateral spot; ovipositor attaining nearly to base of scutellum. The % 

 has only a spot on each side of metathorax instead of a band ; base of 

 coxae black ; abdomen with three broad, continuous yellow bands. 

 Length £ 9 , .40 inch. Parasitic upon Megachile Poeyi, Guer. 



7. Leucospis aflinis. 



Leucospis ajfinis, Say, Long's Second Exped. ii, p. 327, % 9 > (1824). = fraierna 

 Say, Bost. Jour. Nat. Hist, i, p. 269, % 9 ,(1835).= subnotata, Westw. Ent. Mag. 

 ii, p. 215. (1835); Germ. Zeits. Ent. ii, p. 250, %, (1839).= basalis, Klug. MSS. 

 Westw. Germ. Zeits. Ent. ii, p. 204. % 9 , (1839).= canadensis, Walk. Jour. Ent. 

 i, p. 17, £,(1860). 



Hab. — Canada to Texas. Fifty % 9 specimens examined. This 

 common species varies greatly in size {.'!■) — .lb inch) and somewhat 

 in markings. The vertex is more or less tinged with green or purple, 



