364 G. R. CROTCH, M. A. 



B. Thorax convex, base rounded, not margined. 



Elytral epipleurae acuminate before apex; antennae shorter than thorax. 

 Metacoxal line angulate externally, posterior tibial spurs distinct. 



Coeeinella. 



Metacoxal line semicircular Adalia. 



Metacoxal line incomplete externally. 

 Metasternum margined in front. 



Epipleurae of elytra concave < 'ycloneda. 



Epipleurae flat Harmouia. 



Metasternum not margined Anisocalvia. 



Elytral epipleurae continuous to apex, antennae elongate. 

 Last joint of antennae truncate. 



Prosternum compressed, metasternum simple Inatitt. 



Metasternum margined in front..... Mysia. 



Last joint of antennae rounded Psyllobora. 



Doubtful Species. 



Cocchstella menetriesi, Muls. — Mulsant (Spec. p. 104) describes 

 this species from Northern California and Russian Asia. It is not 

 rare in parts of Siberia, Mongolia, Persia aud Egypt, and is merely a 

 geographical form of the Western European 0. W-punctata ; its oc- 

 currence in California is to me extremely doubtful. 



Thalassa Montezuma, Muls. — Mulsant (Spec. p. 512) records 

 this species from New Orleans, as having been collected by Pilate. It 

 is not rare in Mexico, but further evidence is required before it can 

 be regarded as North American. 



MEGILLA, Muls. Spec, p. 24. (Type maculata.) 

 Thorax subquadrate, sinuate at base which is produced into a 

 rounded lobe and distinctly margined, meso-coxal line none, claws 

 dentate at the base, posterior tibial spurs distinct. 



M. maculata, (DeGeer), Mem. v., 392, 1, t. 16, f. 22; Muls. Spec, p. 28, 4; 

 fascilabris, (Muls.) Mon., p. 22, 2. — Oval, black, alutaceous, thorax and elytra 

 ochreous-yellow, spotted with black, punctulate; the thorax has an obtriangu- 

 lar black spot on either side the median line; scutellum black, elytra with two 

 common spots (one scutellar, one at three-fourths), and four arranged longitu- 

 dinally ; one on the callus, one medial larger, one at three-fourths and one 

 sub-apical. L. -20— -22 inch. 



United States, Central and South America. 



M. vittigera," (Mannh.) Bull. Mosc. xvi., p. 312, 297; (Muls.) Spec, p. 

 33, 2. — Ovate, black, alutaceous, thorax as iu M. maculata, elytra with the 

 suture and a dorsal vitta black, both are attenuate towards the apex, which 

 they do not reach. L. "20 inch. 

 California, Kansas, Mexico. 



