136 TWENTY-FOURTH REPORT ow THE STATE MUSEUM. 



IX. NOTES ON EUCHRES EGLE (DEUHT). 



A colony of the young larvae was taken on the milkweed (Asdepias 

 cornuti) July 20th, collected in an irregular cluster on one of the 

 leaves. Their appearance at this stage was so unlike that presented 

 when more advanced, that the species would not have been suspected, 

 but from the food plant on which they occurred. 



On the 21st, having consumed the leaf on which they were feeding, 

 they moved to the top of the jar beneath which they had been 

 placed, where they collected in a body. They were now three-tenths 

 of an inch in length. The head was subquadrate, glossy black. 

 Collar fuscous. Body deeply incised, obscure green, with round fus- 

 cous tubercles dorsally, and oval ones laterally, from which radiate 

 white hairs of unequal length, those on the four anterior and two 

 posterior segments being longer than elsewhere, and intermingled 

 with dusky hairs. Legs spotted with fuscous, and prolegs with a 

 fuscous spot outwardly. 



On the 23d they were found to have undergone a molting, 

 and were traveling with a very rapid motion in every direction about 

 the jar. Later in the day, they had again collected in a cluster, 

 when fresh food was supplied them, upon which they arranged them- 

 selves with some degree of regularity, but not with the striking 

 parallelism which characterizes their feeding when met with in the 

 field. 



The larva now appears with twelve rows of tubercles, disposed 

 in two ranges on each segment, the tubercles alternating on the 

 anterior and posterior portions of the segment. 



The first segment has some short white hairs projecting over the 

 head. On the second segment are four black pencils, each with a 

 single hair projecting beyond the others ; the two inner pencils are 

 the longer, and the single hair extends to nearly twice the length of 

 the pencil. The third segment has its interior pencils like those of 

 the second, but its exterior ones are without the long hair. The 

 fourth segment has a double pencil issuing from the two anterior 

 dorsal tubercles, with four white pencils from the four tubercles next 

 below. Segments five to nine inclusive have each four orange pencils 

 curving inward and forward, of which the two anterior proceed from 

 the two superior tubercles, and the two posterior from those next 



