June 1B99 ] Casey: On American Coccinellid/e. 105 



of habitus, and are consequently difficult to define ; they are generally 

 larger than in Exochomus, but smaller than in Axion. Those before 

 me may be identified as follows : — 



Sterna black, the abdomen red, generally black toward the middle of the base 2 



Sterna in great part red, the presternum alone black ; abdomen red throughout, the 

 legs black as usual ; prothorax more narrowly rounded at the sides ; body deep 

 black above 4 



2 — Elvtral spot small, rounded ; body black above, very broadly oval, the elytra] 

 punctures generally stronger and becoming quite coarse toward the margins ; 

 head distinctly pubescent. Length 4.4-5.0 mm.; width 3.8-4.3 mm. Vermont, 

 New York, Pennsylvania, Indiana and Iowa biv ulnerus Mills. 



Elytral spot more or less evidently larger and always transverse, the head less con- 

 spicuously pubescent ; elytral punctures finer 3 



3 — Broadly oval and less compressed, black with distinct bluish reflection ; sides of 

 the pronotum but little more than a third as long as the median line ; elytral spot 

 large, transversely oval, extending from basal fifth to the middle and from inner 

 fifth or sixth to outer fourth. Length 4.2-4.8 mm.; width 3.4-3.8 mm. Cali- 

 fornia or bus, sp. now 



Narrowly oval and more pointed behind, smaller and narrower than bivulnerus, com- 

 presso-convex, deep black above without metallic reflection ; sides of the pro- 

 notum fully two-fifths as long as the median line ; elytral spot distinctly variable 

 in size, but as an average extending from rather more than basal fourth to a little 

 before the middle and from inner to outer third or fourth.' Length 3. 7-4. 75 mm. ; 

 width 3.0-3.8 mm. California (San Francisco) to Washington State. 



fraternus Lee. 



4 — More broadly oval ; pronotum deeply impressed apically near the angles in the 

 male, with the edge there rufescent ; elytral spot more uneven in outline, gener- 

 ally extending from basal fourth to the middle and from inner fifth or sixth to 

 outer fourth or fifth. Length 5.0 mm. ; width 4.5 mm. Honduras. 



cacti Linn. 



Narrowly oval and more compressed, the pronotum in the male not, or only very 

 feebly and indefinitely, impressed apically near the angles, with the edges there 

 not at all paler ; elytral spot, more evenly outlined, generally extending from basal 

 fifth to the middle and from inner fifth or sixth to outer fourth ; punctures very fine, 

 becoming slightly larger toward the margins. Length 4.4-4.6 mm ; width 

 3.75 mm. California (San Diego) confusor, sp. now 



The longitudinal impression on the flanks of the elytra are analo- 

 gous to those previously noted in Olla, of the Coccinellini. 



Axion Muh. 



These species are the largest of the tribe and are colored nearly as 



in Chilocorus, but with a greater development of the red spot. The 



surface of the elytra is almost completely impunctate ; the pronotum is 



feebly punctate near the side margins, and the apical margin near the 



