96 ILLINOIS BIOLOGICAL MONOGRAPHS [96 



abdominal segments 2 to 6 ; there is also a similar pair of verrucae on 

 segment 7 but none on 8. The dorsomesoii is marked by a dark line. 



Harrisina and Acoloithus have the prothoracic protuberance but 

 there is only one verruca between that of the Kappa group and the 

 proleg on segments 2 to 6 and none on 7 or 8. Harrisina americana is 

 rather common in the eastern states, feeding on grape and Virginia 

 Creeper. The larva is pale except for the dark reddish verrucae. 

 H. metallica of Texas and Arizona has a broad dark red lateral line 

 running just above the spiracle, and transverse intersegmental stripes. 

 The otherwise pale body of H. brillians, from the same region, is gaily 

 decked with two broad reddish transverse stripes, the cephalic covering 

 parts of the last thoracic and first two abdominal segments and the 

 caudal extending from the verrucae of the sixth abdominal segment 

 to those of the seventh. In addition the prothorax, mesothorax, and 

 fourth and eighth abdominal segments bear narrow transverse vittae. 



Acoloithus falsarius is pale, but obscurely dotted above. Other 

 species of Acoloithus and Harrisina are very similar in the larval stage. 

 The adults in this division of the family will have to be studied more 

 carefully before the larvae can be correctly placed. Apparently some 

 of the species have dimorphic larvae. 



The larva of Pyromorpha dimidiata is dull, dark-colored. The 

 prothorax does not bear a subventral protuberance ; the verruca mu is 

 present on the first seven abdominal segments but is not associated with 

 a second verruca as in Triprocris. 



Family Epipyropidae. 



The two species of this family, one Asiatic, Epipyrops anomala, 

 and one American, E. barberiana, are anomalous caterpillars with a 

 parasitic habit. The body is in the form of a depressed hemisphere, 

 the head retractile within the first segments. Both thoracic and ab- 

 dominal legs are present, the claws of the former being peculiar in 

 that they bear a long tooth at the base. The crochets are in a complete 

 circle and, altho uniordinal, are slightly irregular in position and length, 

 their form being degenerate. Secondary setae are sparsely scattered over 

 the entire body. The small head, stout body, and secondary setae 

 indicate an affinity with the Zygaenoidea but reduction has taken a 

 different direction than in Cochlidiidae. There is no sign of verrucae 

 and the crochets are in a complete circle, an arrangement lost even 

 in the Pyromorphidae. 



Family Megalopygidae. 



This family forms one of the important links in the Zygaenoidea, 

 standing between the Zygaenidae themselves and the Cochlidiidae. Its 



