June 1899.] Casey: On American CocciNELLiDiE. 125 



16 — Elytra with a pale marginal vitta which is sometimes abbreviated or resolved into 

 three spots, of which only the middle one remains in several instances 17 



Elytra without a marginal vitta or median marginal spot but with a subapical pale 

 spot 27 



17 — Elytra without ornamentation, other than a circular spot very slightly behind the 

 middle and adjoining the side margin 18 



Elytra without ornamentation, other than a basal marginal vitta extending to slightly 

 behind the middle 19 



Elytra each with three widely separated marginal or submarginal spots 20 



Elytra with an internally sinuate marginal vitta, extending from the base to distinctly 

 behind the middle, and, in addition, with a laige transversely oval subapical 

 spot 21 



Elytra with a continuous or subcontinuous marginal vitta, bisinuate within and not 

 attaining the sutural angle 22 



18 — Lateral spot larger, yellow, nearly two-fifths as wide as the elytron ; pronotum of 

 the female black, with a very narrow faint pale streak at the margin anteriorly, 

 finely, sparsely punctate, the sides moderately convergent ; head nearly as wide as 

 an elytron, black. Length 2.5 mm.; width 1.8 mm. California (Siskiyou Co. ). 



osculans Lee. 



Lateral spot very small and reddish, scarcely more than a sixth as wide as the elytron ; 

 pronotum of the female black throughout, strongly and closely punctate, the sides 

 strongly convergent ; head black, very much narrower than an elytron ; head of 

 the male pale, the side margin of the pronotum also narrowly pale from the apex 

 to basal third. Length 1. 75-2. 3 mm.; width I.5-I.7 mm. Texas (El Paso). 



pleuraiis, sp. nov. 



19 — Marginal vitta extending from very near the basal margin for two-thirds the 

 length, much dilated internally and with rounded outline in its posterior two- 

 thirds, the dilated part emitting a slender transverse spur extending to inner third 

 of the width ; elytral punctures fine and sparse but rather strong ; head and pro- 

 notum black throughout in the female. Length 2.6 mm.; width 1.8 mm. Cali- 

 fornia ( San Diego) t£eniata Lee. 



Marginal vitta beginning at about its own width from the basal margin and continuing 

 to apical two-fifths, only feebly dilated internally with rounded outline posteriorly ; 

 elytral punctures minute and sparse ; head and pronotum black throughout in the 

 female; body more narrowly oval than in teeniata. Length 2.4 mm.; width 

 1.65 mm. Nevada (Reno) nevadica, sp. nov. 



20 — Basal spot rounded, not quite enveloping the basal margin, prolonged posteriorly 

 for a short distance by a rapidly and acutely acuminate spur which is medial with 

 reference to the spot and not marginal ; second spot at the middle larger and 

 semi-circular internally ; subapical spot smaller than the medial, transversely 

 oval, slightly nearer the limb than the suture but quite distant from both ; 

 punctures sparse and fine ; head and pronotum black throughout in the female. 

 Length 2.2-2.35 nim. ; width 1.65 mm. California (Alameda). 



psyche, sp. nov. 

 21 — Marginal vitta extending from very near the base to apical third, gradually nar- 

 rowed from its base for two-thirds its length and then expanded with rounded 



