AMERICAN COLEOPTERA. 77 



Eubriini and the Parinidae in the form of the tarsi. This affinity 

 would be rendered still more striking were the observations of Mr. 

 Crotch confirmed, that the larva of Placonycha Edwardsii resembles 

 that of IMichus or of Fseplienus. 



In another direction there seems to be a relationship existing be- 

 tween the Macropogonini and Cerophjjtum, an aberrant Elateride. 



The DascjllidjB of the Basin of Leman have been made a study 

 by Henri Tournier, (Association Zoologique du Leman, Annee 1867, 

 Geneva 1868), the result being an extremely acceptable pamphlet in 

 which the descriptions are all that could be desired and the plates 

 very clearly drawn. A resume of the more recent papers on the 

 family is given and an arrangement of the genera adopted not differ- 

 ing essentially from that proposed by Lacordaire. 



The family may be divided into two sub-families, which seem to 

 be as natural as they are convenient for the study of the subordinate 

 groups, in the following manner : 



Anterior coxse with large trochantin DASCYLLID^. 



Anterior coxsa without trochantin HELODID^. 



Sub-Family I. — Dascyllid^e. 



The anterior cox^e are transverse, rarely more prominent than the 

 prosternal process which moderately separates them. The trochantin 

 is large and very distinct. The mandibles are always more evident 

 than in the second sub-family. The tibiae are never bicarinate ex- 

 ternally and the spurs comparatively small. The claws are simple or 

 feebly dilated at base, pectinate in Odontoni/x. 



Two tribes are formed by the genera in our fauna distinguished in 

 the following manner: 



Epistoma prolonged, concealing the labrum in great part and the mandibles, 

 posterior coxse narrowly separated Macropogonini. 



Epistoma short, labrum and mandibles visible, posterior coxae contiguous, 

 rarely slightly separated Dascyllini.' 



The trochanters of the anterior and middle legs are elon"-ate in the 

 first tribe, short in the second. 



Tribe I. — Macrojwgonini. 

 Head free, slightly deflexed, received in the thorax as far as the 

 eyes, clypeal suture obliterated, front slightly prolonged in great part 

 concealing the labrum and mandibles in repose. Prosternum moder- 

 ately separating the coxae, usually meeting the mesosternum, the 

 anterior coxae oval not more prominent than the prosternum and with 

 large trochantin. Mesosternum separating the coxae, horizontal or 



