June i8 99 .] Casey : On American Coccinellid^e. 113 



preceding species ; body more elongate-oval, the elytra luteo-flavate, with more 

 narrowly reflexed margins, which are always paler. Length 4.0-5.0 mm. ; width 

 3.5-4.0 mm. New York, Pennsylvania, Indiana and Iowa. murtda Say 



Sublateral spur longer, frequently joining the basal pale border ; medial spur long 

 and narrow, gradually acuminate and extending to or beyond the middle of the 

 disk ; body smaller and rather more rounded, the elytra 'generally bright scarlet 

 in color and with almost completely obselete punctures, occasionally yellow, and, 

 in a northern example, with more distinct punctuation. Length 3.8-4.7 mm.; 

 width 2.9-3.4 mm. California (Sta. Cruz to Siskiyou Co.), Washington State, 

 British Columbia and Idaho (Cceur d'Alene) polita, sp. nov. 



7 — Body broadly rounded and rather less convex, shining, deep black throughout above 

 and beneath, the sides of the prothorax rather less arcuate, and the basal angles 

 more narrowly rounded ; elytral punctures much larger and more distinct than 

 usual but sparse. Length 4.3 mm.; width 3.5 mm. Locality not recorded. 



ater, sp. nov. 

 Atcr is widely divergent, both in coloration and to some extent in 



punctuation and form of the prothorax, but seems to be assignable to 



Cycloneda. The unique type was discovered in the Levette cabinet 



but had no label attached. 



Olla, gen. nov. 



In this dimorphic genus the ventral plates are almost as completely 

 divided by an oblique line as in Coccinella, but the line does not quite 

 form a junction with the posterior bounding curve ; in view of the 

 close similarity of the body with Cycloneda, therefore, I have placed 

 the genus at this point of the series rather than near Coccinella, with 

 which it has little or no affinity. The following species represents the 

 pale forms with spotted dorsal surface, more numerous in Mexico : — 



Broadly oval and strongly convex, very finely and obsoletely punctulate, the side mar- 

 gins as in Cycloneda ; upper surface pale brownish-yellow, the head pale and im- 

 maculate ; pronotum with a basal black spot at two-fifths from the middle and a 

 short transverse spot before the scutellum, also with two poste iorly converging 

 black spots at the centre and a narrow elongate spot on the median line joining 

 the ante-scutellar spot, and, at lateral eighth and basal third, a small rounded 

 spot ; scutellum black in the male ; elytra each with a subbasal transverse series , 

 of four small black spots, a medial series of three spots, the inner the largest and 

 transversely crescentiform and, at apical fourth near the margin, another small 

 rounded black spot; under surface and legs pale. Length 4.25-5.25 mm.; 

 width 3.4-4.0 mm. Indiana, Texas (Brownsville and El Paso), Arizona and 

 California (Sta. Cruz and San Francisco) abdominalis Soy 



The large series before me exhibits an extremely small amount of 

 variation, which, considering its extended geographical range, is very 

 remarkable. The male has the fifth ventral truncate, becoming very 

 feebly sinuate toward the middle, with the edge there slightly concave; 



