WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 75 



in a narrow line to the front coxae. 5. Instead of the tip of joint 1, the tips 

 of abdominal joints 6-8 are narrowly white; and joint 1 is only twice as 

 wide at tip as at its extreme base. 6. In the 4 front legs the coxae and tro- 

 chanters are all white, and there is an indistinct whitish annulus at the base 

 of the middle tibiae. In the hind legs the tips of the coxae and the whole of 

 the trochanters are whitish; the basal $ of the tibiae, the spurs, and the ba- 

 sal § of tarsal joints 1 and 2, are all white; and the extreme tip of the femora 

 and the terminal £ of the tibiae all round, and their middle f exteriorly, are 

 all black. 7. The radial area is less elongate, its posterior angle being only 

 about 120 . Length 0. .19 inch. Front wing $ .18 inch. Ovip. .07 inch. 



The c? differs from $ only as follows :— 1. The tips of the cheeks and the 

 entire face, except a minute black spot below each antenna, are white. 2. 

 The antennae are full as long as the body ; the scape is rufous except a black 

 dot above and a large white spot below; and the 1st joint of the flagellum is 

 rufous below. Instead of the tip of joint 5 and the whole of joints 6-9, it is the 

 tip of joint 9, the whole of 10-14, and the base of 15, that are white in the 

 flagellum all around. 3. The lower h. of the pleura, and the mesothoracic 

 sternum below, are white ; the black spot before the middle coxae very small. 

 4. The abdomen is elongate-oval, \ longer than the head and thorax to- 

 gether, and rufous immaculate, save that the extreme tip is obfuscated. 5. 

 The hind tarsi are entirely white, except joints 4 and 5, and a dot at the tip 

 of joint 1, which are fuscous. Length o" .27 inch. Front wing o* - 2 o inch. 



One d 1 ; one $ . The ? comes very near rhomboidalis $ , n. sp., 

 especially in the rhomboidal black spot on the pectus, whence 

 that species takes its name, but is sufficiently distinct by the short 

 orbits, the black cheeks, the whitish hind trochanters, the white 

 hind spurs, and the biannulated hind tarsi. From the other three 

 species belonging to this group, it diners in the same way as 

 rhomboidalis. The sexual distinction in the locus of the anten- 

 nal annulus is remarkable, and occurs also in Cr. atricollaris , 

 n. sp. 



CryptllS rufifrons, n. sp. — $.— Differs only as follows from the normal 

 atricollaris ? : — 1. The size is rather smaller. 2. The orbits (very wide 

 above the cheeks), face, clypeus, mandibles except their teeth, and cheeks, 

 are all pale rufous; and the palpi are yellowish white. 3. The antennae 

 are only f as long as the body, absolutely full as stout as in atricollaris $ 

 and therefore relatively stouter; the white annulus is narrowly tinged with 

 dusky below, especially on joint 9; and the 1st joint of the flagellum is only 

 4 (not 6) times as long as wide. 4. The thorax is nowhere tinged with yel- 

 low. The metathorax has the lateral areas, as well as their cross-carinae, 

 pretty distinct; a small triangular basal area; a small and indistinct obtri- 

 gonate central area; and a large, declivous, pentagonal, posterior area. 

 The white line under the front wing is conspicuously prolonged down- 

 wards ; the white line under the humeral suture does not nearly attain its 

 tip and is obtuse in front; there is no discoidal white spot on the mesono- 



