COCCINELLID^^— EROTYLIDaE. 81 



Chilocorus ulkei sp. nov. 

 PL IX, fig. 8. 



Two specimens are here referred to this genus, although, possibly by 

 thp conditions of preservation, they differ from the members of this group 

 in one of its most distinguishing charactei'istics, the deep and sudden ante- 

 rior emargination of the prothorax. In the fossil it hardly appears to be 

 much more emarginate than in other neighboring Coccinellidag; but the 

 expanded gense of the head, the small size of the prothorax, the rotundity 

 and unusually dark color of the elytra, which are here piceous, and the 

 general form of the whole body make it tolerably certain that it belongs in 

 this group, and the absence of any visible sign of a labrum indicates that 

 it should be placed here rather than in Exochomus. It is of about the same 

 size as our native species, or a trifle smaller. The shape of the elytra is 

 the same, excepting that the humeral angle is scarcely so prominent; they 

 are, however, uniformly black, and more coarsely, heavily, and distantly 

 punctate than in C. hivulnerus Muls.; the shape of the prothorax is also the 

 same except for the lesser emargination, which scarcely appears in the 

 specimen selected for illustration and which is obscure at this point; the 

 prothorax is less deeply punctate than the elytra, but differs from our mod- 

 ern species in the same way as do the elytra; its disk is dark like the elytra, 

 and the head is infu seated, but the sides of the prothorax are of a light 

 color and were probably red in life. One antenna is preserved on one 

 specimen, showing a considerably stouter club than in C. "hivulnerus. 



Length, 4.5 mm.; breadth of thorax, 2 mm.; of elytra, 3.6 mm. 



Florissant, Colorado; two specimens, Nos. 11227, 11929 and 12482. 



Named for the coleopterist, Henry Ulke, of Washington. 



Only three fossil forms of this family are known, representing as many 

 genera, two of them reported from amber, one in the early Tertiarv of 

 Wyoming. 



MYCOTRETUS Lacordaire. 



An American geims with numerous species, mostly found in the Tropics; 

 a very few species occur in the United States. One species has been found 

 fossil in Wyoming. 



MON XL 6 



