78 TRANS. ST. LOUIS ACAD. SCIENCE. 



cross-carinaeof the lateral areas and a trace of their tips, and a semicircular 

 hasal area, the disk of which last is polished and smooth. Tegulae, a short 

 line under the front wing, a line underlying the humeral suture nearly to- 

 ils tip, which line is usually resolved into a basal and terminal dot, the lat- 

 ter and sometimes both of which are often obsolete, both scutels, the ante- 

 rior edge of the collare generally, and an obscurely-defined, horseshoe- 

 shaped spot on the hind part of the metathorax, sometimes reduced to a 

 mere roundish spot on the tip of each lateral area, sometimes entirely obso- 

 lete, all white. Abdomen rufous, elongate, oval, subpolished, with very 

 minute rather sparse punctures. Joint i, 3J times as long as wide, 2i times 

 as wide at tip as at base, its sides gently concave % of the way to the tip, 

 where the srnall tubercles are placed, thence subparallel and subconvex to 

 the tip. Joint 2 longer by J or ^ than wide, and twice as wide at tip as at 

 base ; joint 3 square or rather shorter than wide ; the rest slowly shorter 

 and shorter. Base and extreme tip of joint i generally whitish, and a large, 

 semicircular, dorsal, white spot always on joint 7. Basal \-\ of joint 2, 

 sometimes the basal \ of joint 3, or of 3-5, and the extreme tip of joint 5, 

 and always the whole of 6-8, except rarely the terminal § of 6, and always 

 the white spot on 7, all black. Venter pale rufous, tip blackish. Le^s ru- 

 fous. The 4 front legs with their coxie and trochanters white, the coxae 

 occasionally tinged with rufous. Hind legs with the extreme base of the 

 basal trochanters often blackish, the 2d trochanter often whitish below, and 

 the terminal J of the femora black ; tibiae fuscous, their basal J whitish ; 

 spurs whitish ; tarsi pale fuscous, with the extreme base of joint i and some- 

 times of 2 also, the terminal i-j^ of 2, and the whole of 3 and 4, more or less 

 obviously white or yellowish-white, sometimes entirely fuscous except the 

 extreme base of all the joints. Wings subhyaline ; veins black ; stigma 

 black, its basal i yellowish-white. Radial area short, its posterior angle 

 110° or 120°. Areolet almost regularly pentagonal, its outer side usually 

 rather shorter than the inner side, and the 2d recurrent vein often entering 

 it rather nearer its base than its tip. Length c? .17-28 inch. Front wing c? 

 .13-21 inch. 



Fourteen c? ; $ unknown to me. A rather variable species. 

 The variation in the coloring of the clypeus is especially remarka- 

 ble and unusual. Distinct at once from atricollaris^ n. sp., rhoni' 

 boidalis^ n. sp., cinctipes^ n. sp., rufifrons^ n. sp., and semirufus^ 

 Brull^, by the antennae not being annulate ; and from Cryptus? 

 (^Ischnus) albitarsts, Cress., and Cr. nigricalceatus^ n. sp., by 

 the much less slender abdomen. 



To this section belong also Cr. semirufus^ Brull6 (N. Am.), 

 and, if with Brull^ we reject the genus Hoplismenus, Grav., II. 

 thoracicus^ c?. Cress., which differs from all the preceding by 

 having the thorax black, with the scutel and the metathorax 

 rufous. 



