KEY TO CERTAIN MELOID/E. 



Some of our other genera, and the more important 

 species, may be separated as follows: 



1. Front not prolonged beyond the base of the antennas; 

 labrum (upper lip) small, scarcely visible. Tribe Horiini, 

 of which Tricrania sanguinipennis should be looked for in 

 sandy places. It is about .3 in. long; black, with brick- 

 red elytra. 



Front prolonged; labrum distinct 2. 



2. Mandibles prolonged beyond the labrum, acute at 



tip 3- 



Mandibles not prolonged, obtuse; elytra entire; 

 antennas straight, not thickened toward the apex. Tribe 

 Cantharini 4. 



3. Elytra rudimentary; no wings; tarsal claws not cleft. 

 Tribe Sitarini, to which Hornia minutipennis belongs. It 

 is reddish-brown; length about .7 in.; parasitic upon a 

 ground-bee (Anthophdra). 



Elytra entire ; tarsal claws cleft. Tribe Nemognathini : 

 Nemognatha has the outer lobe of the maxillae (accessory 

 jaws below or behind the mandibles) prolonged; it is not so 

 in Zonitis. 



4. Second joint of antennae at least one-half as long as 

 the. third. Macrobasis. M. unicolor: .3 to .5 in. long; 

 black, rather densely clothed with grayish hairs, which 

 give it an ashy color; second joint of male's antennas 

 slightly longer than the next two and nearly twice as wide. 

 The adults occur on various plants including potatoes 

 and ironweed. 



Second joint of antennas much less than half the length 

 of the third 5. 



5. Next to last joint of tarsi bilobed Tetraonyx. 



Next to last joint of tarsi cylindrical '.6. 



6. Front femora with a silken, hairy spot on the under 

 side; second joint of antennas very short; mandibles short. 

 Larvae, as far as known, feed on eggs of grasshoppers. 

 Epicauta 7. 



Front femora without a silken, hairy spot 13. 



7. Antennal joints of equal thickness throughout, cylin- 

 drical, and closely united; eyes nearly as wide as long, 

 feebly or not at all indented in front 8. 



Antennal joints on apical half more slender, loosely 



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