6 



BULLETIN 967^ U. S. DEPAKTMENT OF AGRICULTURE. 



AA.. Second joint of antennae less than half as long as third Epicauta. 



a. Antennal joints elongate, loosely united. 

 b. Unicolorous. 



c. Gray or yellowish E. cinerca Forst. 



cc. Black. 



d. Large, 25 to 30 mm. long E. corvmaLiee. 



dd. Less than 20 mm. long. 



e. Spurs of hind tibia stout, cylindrical ; length 



12 to 20 mm. (fig. 4) E. funebris Horn. 



ee. Spurs of hind tibia slender, acute at tip 

 and unlike, the outer spur being broader ; 

 length 8.5 to 14 mm E. peimsylvanica. DeG. 



Fig. 3. — The two - spotted 

 blister beetle (Macrohasis 



albida) : Adult, striped Fig. 4. — Epioauta ficnehns: 

 variation. Eularged. Adult. Enlarged. 



bb. Variegated. 



c. Gray or yellowish with black markings. 



d. With three longitudinal black stripes on each 



elytron E. lemoiiscata Fab. 



dd. Spotted with black. 



e. Spots minute, scattering E. maciilata Say. 



ee. Spots larger, crowded, sometimes coalescent. 



E. pardalis Lee. 

 cc. Black, elytra and prothorax margined with gray, and 



median line of prothorax gray E. marginata Fab, 



aa. Antennal joints short, closely united. 



b. Pronotum with pair of bare, smooth, black areas ; color reddish 



or grayish brown E. callosa Lee. 



bb. Pronotum unmarked. 



c. Surface of pronotum moderately shining under vesti- 



ture E. ferruginea Say. 



cc. Surface of pronotum opaque E. seHcans Lee. 



The only distinction between Macrobasis and Epicauta is in the 

 relative length of the second segment of the antennae (figs. 5, 6). In 



