Sept., I9I4-] Dyar: New York Slug-Caterpillars. 223 



quadrangle distinguish it from all of the species with yellow abdomen 

 except H. kuntzci Cockerell which has a green, not blue, head and 

 thorax, and has the facial quadrangle as broad below as above and 

 the eyes scarcely if at all emarginate. 



Habitat. — Eddy, New Mexico, i (=type) from flowers of MaU 

 vastrum, April 13 (Cockerell). 



I 



THE LIFE HISTORIES OF THE NEW YORK 

 SLUG-CATERPILLARS.— XX. 



By Harrison G. Dyar, 



Washington, D. C. 



The series of papers published in the Journal of the New York 

 Entomological Society, under this title, which ceased in 1899, was 

 subsequently continued in 1907 by an account of an additional species, 

 then just worked out. The species which will be now discussed has 

 not been studied from New York material and there are no actual 

 records of the species occurring in the state, yet the probability is 

 that it does so occur, at least occasionally. In 1883 it was taken in 

 Morris Plains, New Jersey, this year having been apparently a 

 specially favorable one for slug-caterpillars, as I remember that 

 PJiobctron pitlicciiim was remarkably common that year in New York. 

 Again, Isochactcs hcntcnuiHcllcri, with a typically southern distribu- 

 tion, was taken on Staten Island in 1901 by Mr. Joutel. With these 

 records, therefore, I am inclined to list Monolcuca semifascia, here 

 discussed, as one of the New York slug-caterpillars. 



I have been attempting to obtain this larva for the past fifteen 

 years. My first trips to Morris Plains, N. J., in 1898 and 1899, were 

 unsuccessful, as were three subsequent ones to Tryon, North Caro- 

 lina, where Mr. Fiske had taken adults. In these trips it was sought 

 to find larvce, and the lack of success led me to suspect some unusual 

 habit or food plant. However, such does not seem to be the case. T 

 simply missed finding the larvae. On the fourth trip to Tryon, N. C, 

 in 1911, with the light tent described by Mr. H. S. Barber (Proc. 



