June 1899.] Casey : On American Coccinelud^e. 75 



The Rhyzobiini are not marked with an asterisk as they have been 

 to some extent acclimated in California ; they are not however, as far 

 as known, endemic. 



Hippodamiini. 



The characters heretofore used to distinguish this tribe from the 

 Coccinellini are of little or no value, as the sternal and ventral post- 

 coxal plates or arcs are frequently both as distinct in the former as in 

 the latter, but the ventral plates are always short, as in those Coccinel- 

 lini allied to Adalia. 



The Hippodamiini are not relatively very numerous and are almost 

 essentially American. They may be distinguished at once from the 

 Coccinellini by the elongate-oval form of the body, narrowly separated 

 intermediate coxae and the other characters given in the table. The 

 frequently obsolete or ill-defined post-coxal lines are the obvious re- 

 sult of long disuse, as the legs are unusually developed for the present 

 family and perfectly non-retractile. The genera before me may be 

 distinguished as follows : — 



Tarsal claws simple, being evenly arcuate, slender and very acutely pointed, with a 



more or less slight bulbiform enlargement at base 2 



Tarsal claws acutely pointed, with a large quadrate basal tooth within, separated from 



the slender apical part by a deep acute fissure — a very usual structure in Coc- 



cinellida? .6 



Tarsal claws slender, bifid within behind the apex, the two lobes unequal in length 



and both acutely pointed .7 



2 — Sternal and ventral coxal plates both dis inct ; basal angles of the prothorax obtuse 



but distinct and not rounded 3 



Sternal plates distinct, the abdominal obsolete 4 



Sternal and ventral plates both completely obsolete 5 



3 — Body oval, the elytra maculate and strongly punctate ; side margins all strongly 



and quite broadly reflexed a nisosticta 



Body elongate and subparallel, the elytra vittate and finely punctate ; side margins 



very narrowly reflexed Macronftmia 



4 — Basal angles of the prothorax broadly rounded IMsmia 



5 — Basal angles broadly rounded as in Namia Parana?mia 



6— Body nearly as in Namia, the elytra andpronotum almost similarly ornamented ; 



sternal and ventral plates both completely obsolete Megilla 



7 — Base of the prothorax rounded in the middle ; sternal and ventral plates variously 



developed or wanting ; Hippodamia 



Another genus of our fauna, — Ceratomegilla of Crotch, — is un- 

 known to me but is said to differ from Megilla in having the third 

 joint of the antennas dilated and triangular. Eriopis, which is said to 



