junei8 99 .] Casey: On American Coccinellid^e. 135 



3 — Body castaneous in color throughout, rather more broadly oval, shining, the elytra 

 rather strongly, moderately closely punctate. Length 1. 1 mm.; width 0.75 

 mm. Michigan (Marquette) marginata Lee. 



Body black throughout, the under surface and legs more piceous in atronitens 4 



4 — Pronotum minutely but strongly reticulate and alutaceous ; elytra finely but rather 

 strongly, sparsely and somewhat unevenly punctate. Length 0.8-I.0 mm. ; 

 width 0.6-0.7 mm. Pennsylvania to Texas (Brownsville) misella Lee. 



Pronotum perfectly devoid of minute reticulation and highly polished throughout like 

 the elytra, finely punctulate, the sides almost continuous ; elytra distinctly longer 

 than wide, gradually narrowed behind, the punctures extremely minute but deep, 

 even and relatively sparse; size much larger. Length I.15-I.3 mm. ; width 

 0.8-0.9 mm - California (Siskiyou Co. ) atronitens, sp. nov. 



5 — Narrowly oval, the prothorax as wide as the base of the elytra, the sides nearly 

 continuous ; elytra narrowed behind from far before the middle, finely and not 

 very conspicuously punctured. Length 0.85 mm. ; width 0.55 mm. Texas. 



minuta, sp. nov. 



More broadly oval, the prothorax much narrower than the elytra, with the sides dis- 

 tinctly discontinuous ; elytra but little longer than wide, more rapidly narrowed 

 behind from a point which is but little before the middle, the punctures strong, 

 deep and rather close-set, much more conspicuous than in minuta. Length 0.8 

 mm. ; width 0.65 mm. California planlceps, sp. nov. 



6 — Spots oval, narrowly separated at the suture ; pronotum not distinctly punctate. 



coccidivora Ashm. 



Ova/is, said by Dr. Horn to be the same as felschei Weise, is 

 omitted from the table, as I have not seen a specimen ; the suture is 

 said by Dr. Horn to have the marginal stria not evident, but this is 

 not borne out by the description of LeConte, or by the other species ; 

 it is brown in color, 0.8 mm. in length and inhabits Florida. It is 

 quite possible that coccidivora may differ generically, but not having 

 an example before me I am unable to decide. 



Stethorus Weise. 

 The species of this genus are as small as in Smilia, but differ very 

 greatly structurally; they differ from Seym nits 'in the fc mation of the 

 front of the head and presternum. The genital segment is as large 

 and conspicuous as in the Hyperaspini. Stethorus is probably cosmo- 

 politan and the species are rather difficult to distinguish among them- 

 selves. The following table contains all that are known to me at 

 present, those from Europe and Africa being introduced for the sake 

 of completeness : — 



Metacoxal plates short and very broad, never extending much beyond the middle of 

 the segment 2 



Metacoxal plates narrow and strongly rounded, much longer, approaching closely to 

 the hind margin of the segment ; species more minute as a rule 6 



