76 TRANS. ST. LOUIS ACAD. SCIENCE. 



turn ; and the metathoracic scutel is rufous, not white. The collare, except 

 its white lines and a large black spot above, is rufous ; all the depressed 

 areas surrounding the 2 scutels are black; and there is a small b'ack spot 

 in the excavation before the middle coxs. 5. Instead of the base, abdomi- 

 nal joints 6-8 are tinged with yellow. Joint 1 is thrice as long as wide, and 

 thrice as wide at tip as at its extreme base, and its tubercles are pretty large 

 and acute ; the capillary line on joint 3 is distinct, that on 4 obsolete ; and 

 the ovipositor is rufous. 6. The legs are pale rufous ; the 4 front legs with 

 their coxae and trochanters pale yellow; the hind legs with their tibiae and 

 tarsi obfuscated. 7. The posterior angle of the radial area is 120 , and the- 

 area consequently is less elongated. Length $ .27 inch. Front wing $ 

 .22 inch. Ovip. .10 inch. 



One ? ; % unknown to me. Distinct by its rufous face, &c.,. 

 from all the other species belonging to this section. 



CryptUS? (Ischnus, Cress.) albitarsis, Cress.— $.— In one specimen the 

 white bilobed spot on the disk of the face is confluent with the white orbits; 

 and in both the clypeus is white, except its extreme tip, which is black; and 

 there are very narrow white orbits behind, but not above, the eye. The 

 1st joint of the flagellum is full thrice as long as wide. In the thorax the 

 parapsidal grooves are deeply impressed, and in one specimen the white 

 line underlying the humeral suture is reduced to a mere basal dot. In one 

 specimen the scutel is entirely white. In the metathorax the lateral areas 

 want their outer sides, the basal area is obsolete, and the central area is 

 pentagonal (not "subquadrate") with its lateral sides indistinct; posterior 

 area indistinctly hexagonal. In the wings the radial area is elongate, its 

 posterior angle being 135 . The areolet is rhomboido-pentagonal, its inner 

 and outer sides subequal and the longest, the two hind sides subequal and 

 each £ shorter, and the anterior side h. shorter than the outer one. Legs 

 black. The front legs with their coxae inferiorly, and the whole of their 

 trochanters, knees, tibiae, and tarsi, white ; and the front face of the femora 

 pale rufous. Middle legs the same, except that the 2d trochanter is black 

 and the 1st is vittate above with black, and that the entire base of the femora 

 is black. Hind legs, with sometimes the basal § of the basal trochanters 

 beneath, and always the tarsus, except the extreme tip and the basal £-£ of 

 joint 1 which are dusky, white. Abdomen S times as long as wide, the 1st 

 joint 6 times as long as wide, only ±-\ wider at the tip than at the extreme 

 base, the tubercles placed § of the way to the tip. Joint 2, z\ times as long 

 as wide, and if times as wide at tip as at base. The rest rapidly shorter 

 and shorter. Length tf .43-45 G37-.42 Cress.) inch. Front wing $ .27- 

 .29 inch. 



Two 6* ; ? unknown to me. The discrepancy in the colora- 

 tion of the legs, as compared with Mr. Cresson's description, is 

 considerable, and may be attributed partly to variation, partly to 

 alcoholic transcoloration, and partly perhaps to the sacrifice of 

 verity to brevity in the description. It is singular that in every 



