June 1S99.] Casey : On American Coccinellid.e. 151 



tured ; male with a small feebly concave glabrous area on the first segment bord- 

 ered by finer denser piliferous punctures, the fifth sinuato-truncate and impressed 

 as usual. Length I.7-I.9 mm.; width 1. 3-1.45 mm. California (Humboldt 



and Siskiyou Cos. ) me n docino, sp. now 



55 — Prothorax large, nearly as wide as the elytra, about two and one-half times as 

 wide as long, the sides slightly discontinuous, feebly convergent, evenly and 

 moderately arcuate, the punctures fine, sparse, but slightly larger and less sparse 

 toward the sides ; elytra about as long as wide, finely, rather feebly and sparsely 

 punctured, the pubescence moderately long and coarse, sparse and slightly dark 

 in color ; head of the male red in apical third ; middle and hind femora black at 

 base. Length 2.0-2.25 mm.; width I.5-I.7 mm. California (Sonoma Co.). 



StyglCUS, sp. nov. 

 Prothorax relatively smaller, much narrower than the elytra, shorter and more trans- 

 verse, the sides strongly convergent, evenly and strongly arcuate and very 

 markedly discontinuous with those of the elytra, the punctures nearly similar ; 

 elytra barely as long as wide, more coarsely, quite strongly, very evenly and not so 

 sparsely punctured, the pubescence very fine, even, decumbent, dark in color and 

 inconspicuous ; head black, the extreme apical margin of the clypeus pale in the 

 female, probably more in the male ; hind femora black at base, the trochanter 

 pale. Length 2.1 mm.; width 1.6 mm. California (Siskiyou Co.). 



tenuivestis, sp. nov. 

 56 — Rather broadly oval, smooth, black, the clypeal apex, tip of abdomen feebly, 

 and legs throughout, pale testaceous ; prothorax relatively rather small, much 

 narrower than the elytra but only moderately transverse, the sides discontinuous, 

 moderately convergent, evenly and feebly arcuate, the punctures rather large 

 and close-set in the middle, shallow, variolate and feebly umbilicate, becoming 

 fine and sparser toward the sides ; elytra evenly, finely but strongly, moderately 

 closely punctured, the pubescence rather coarse but unusually short, subdecum- 

 bent, ashy and distinct. Length 1.8 mm.; width 1. 4 mm. Arizona (Grand 



Canon of the Colorado) — Dr. Prudden papago, sp. nov. 



57 — Prosternal carinae entire as usual ; elytral pale areas more or less nubilate and 



variable in extent 58 



Prosternal carinre not quite attaining the apical margin 62 



58 — Body broadly oval 59 



Body narrowly oblong-oval 61 



59 — Body depressed, the pale areas of the elytra predominating 60 



Body normally convex, testaceous, the pronotum with a large parabolic black spot 

 nearly attaining the apex, the elytra black, each with a short, narrow, longitudinal 

 and slightly oblique median vitta at the middle of the disk, which sometimes 

 almost disappears, the under surface black ; legs dusky, the femora black except 

 at tip ; prothorax closely and strongly punctulate, the sides slightly discontinu- 

 ous, rather strongly convergent and evenly arcuate ; elytra fully as long as wide 

 finely but strongly, evenly and very closely punctate. Length 1. 8-2.0 mm.; 



width 1. 25-I.45 mm. Arizona (Yuma) nubes, sp. nov. 



•60 — Elytral punctures moderately large and not very close-set ; upper surface testa- 

 ceous, the pronotum with a broad parabolic black spot not attaining the apex, 

 the elytra with a large triangular black common spot extending nearly to the 



