BULLETIN 967, U. S. DEPARTMENT OF AGRICULTURE. 



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



a. Antenna! joints elongate, loosely united, 

 b. Unicolorous. 



c. Gray or yellowish E. cinerea Forst. 



cc. Black. 



d. Large, 25 to 30 mm. long E. corrina Lee. 



dd. Less than 20 mm. long. 



e. Spurs of hind tibia stout, cylindrical ; length 



12 to 20 mm. (fig. 4)__£. 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. pennsylvanica DeG. 



Fig. 3. — The two - sported 

 blister beetle [Macrobasis 



alb Id a) : Adult, striped Fig. 4. — Ep leant a funebris: 

 variation. Enlarged. Adult. Enlarged. 



bb. Variegated. 



c. Gray or yellowish with black markings. 



d. With three longitudinal black stripes on each 



elytron E. lemniscata Fab. 



dd. Spotted with black. 



e. Spots minute, scattering E. maculata Say. 



ee. Spots larger, crowded, sometimes coalescent. 



E. par dal is 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. sericans Lee. 



The only distinction between Macrobasis and Epicauta is in the 

 relative length of the second segment of the antenna? (figs. 5. 6). In 



