74 TRANS. ST. LOUIS ACAD. SCIENCE. 



black, by the smaller size, and by the relatively smaller length of 

 the ovipositor, viz. less than J instead of f of the body. 



CryptUS rhomboidalis, n. sp. — $. — Differs from the normal atricollaris 

 $ only as follows : — i. The size is almost ^ smaller. 2. The orbits are 

 widely interrupted behind the eyes, and are relatively narrower except on 

 the face, and there is no quadrate white spot above the clypeusand none on 

 the vertex. 3. The antennae are absolutely as stout as in atricollaris, and 

 therefore relatively much stouter; the white annulus is narrowly brown- 

 black beneath, and the first joint of the flagellum is only 3J (not 6) times 

 as long as wide. 4. The thorax is nowhere tinged with yellow ; there is a 

 large rhomboidal black spot in front of the middle coxae, prolonged in a 

 narrow line to the front coxae ; the anterior edge of the mesothoracic pleura, 

 and all the depressed areas surrounding the 2 scutels, are black ; the white 

 line under the humeral suture stops short of its extreme tip ; and there is 

 no white spot on the disk of the mesonotum. 5. Instead of the tip of abdo- 

 minal joint I, the tips of two or three of the anal joints are narrowly white, 

 6. In the 4 front legs the coxae and trochanters are all white ; in the hind 

 legs the femora and tibiae are dark rufous, the latter infuscated at the ex- 

 treme tip and whitish on their basal \, and the tarsi are pale rufous. 7. The 

 radial area is less elongate, its posterior angle being only 120°. Length $ 

 .17 inch. Front wing $ .15 inch. Ovip. .07 inch. 



One ? ; S unknow^n. Distinct from iridescens^ Cress. S and 

 soror^ Cress. S by the thorax not being generally black and by 

 the abdomen not being partly black, and from the former also by 

 the unicolorous hind tarsi. Comes very near the brief and indefi- 

 nite description oi semirufus^ Brulle (N.Am.), but differs by the 

 metathorax not being more strongly punctured than the rest of the 

 thorax, by the much smaller size (about J), and by the relatively 

 shorter length of the ovipositor (i the body instead of t). 



CryptUS Cinctlpes, n. sp. — $. — Differs from the normal airicollaris $ 

 •only as follows: — i. The size is almost J smaller. 2. The orbits are very 

 narrow, and are obsolete except on the face ; there is no white spot above 

 the clypeus and none on the vertex, and the cheeks are black. 3. The an- 

 tennae are only | as long as the body, absolutely nearly as stout as in atri- 

 collaris $ , and therefore relatively much stouter ; besides the scape, joints 

 1-3 of the flagellum are rufous beneath; the lower surface of the white an- 

 nulus is narrowly tinged with dusky; and joint i of the flagellum is only 4 

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

 low. In the metathorax the whole posterior sides of the lateral and central 

 areas are present, so as to show a complete posterior area ; there is no dis- 

 coidal white spot on the mesonotum ; the anterior and upper edge of the 

 mesothoracic pleura is black so as to enclose the white line under the front 

 wing; all the depressed areas surrounding the two scutels are black; and 

 there is a large rhomboidal black spot before the middle coxae, prolonged 



