122 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xn, 



bearing a Blender seta, like those near and at the ends of those in front. The two dorsal rows of abdominal spines extend 

 back to and including the seventh uromere. 



[Manuscript notes by Messrs. Pergande and Pratt show that moths of H. artemis 

 (bred from larvae received from New Mexico) emerged in Washington from October 25 to 

 November 9, the last from a larva received as early as June 6. Eggs hatched April 30. A 

 species of Tachinidas was bred from a pupa, and specimens of Apanteles, bred from this species, 

 were sent from Las Cruces, N. Mex., by T. D. A. Cockerell.] 



[The following description is given in the MS. under H. maia, but it presumably belongs to 

 artemis:] 



Larva. — Stage I: The following is a description of larva? hatched from eggs sent me from 

 Las Cruces and laid on the willow (Salix longifolia). They hatched May 4-16. On May 11 

 one was seen emerging from the shell; it comes out tail first. 



The underside of the body, the legs and tubercles, were of a deep flesh color; the body 

 reddish brown, the sutures between the segments deep carneous. The clypeus anterior is paler 

 than the rest of the head. The body tapers somewhat to the end, which is somewhat conical. 

 The head is considerably wider than the body, dull black, with white hairs. The colors after 

 an exposure of a day or two, before eating: Body black-brown, the tubercles on the three 

 thoracic segments much paler, black brown, being of a deep flesh brown, but those on the 

 ninth abdominal segment are nearly as dark as those on the thoracic ones. Under side of the 

 body deep carneous, concolorous with the abdominal legs. The thoracic legs are all somewhat 

 darker than the abdominal ones, especially on the outside. 



[The following account by Prof. C. H. T. Townsend, indicating the possible occurrence of 

 two species of the H. mam group in southern New Mexico, appeared in West American Scien- 

 tist, VIII (1S93), pp. 51-53. Hemileuca artemis Packard. A note was published on this 

 species in Can. Ent., 1892, pp. 199-200, under name of H. juno (?). A pupa obtained from 

 larvae on Populus fremontii 1 in June, 1891, and sent to Dr. Packard, had disclosed the moth, 

 which Dr. Packard wrote was probably H. juno. Under date of April 29, 1S93, Dr. Packard 

 again wrote that this was apparently a new species, which he would name as above. What 

 appeared to be the same larvae were found at that time, June, 1891, on Salix longifolia also. 

 On November 13, 1892, I found in the Alameda, north of Las Cruces, an egg mass of Hemi- 

 leuca encircling a twig of the above Salix. The next day I found two more of the egg masses 

 on the Salix in the same locality, and, what was more, I saw on, or flying about the Salix, several 

 moths of Hemileuca, one of which I captured. This was sent to Dr. Packard, who wrote that 

 it was "with little doubt H. maia." I had expected it would prove to be H. artemis, and I was 

 therefore somewhat disappointed. Several more moths, apparently the same but not captured, 

 were seen during the latter part of November flying about cottonwoods south of Mesilla Park. 



It had occurred to me that possibly the larvae which feed here on Salix are H. maia, while those on Populus are 

 H. artemis. This conclusion is shaken by the fact that I have taken the larvae of //. maia on mesquite, and they are 

 much darker (reddish, brownish, or grayish) than those taken on Populus and Salix in June, 1891, and lack the yellow- 

 ish or greenish shades of the latter. From the general darker color of the maia larva, I believe I can distinguish the 

 two species as they occur .here. According to this separation, I find that H. artemis feeds here on Populus and Salix, 

 while H. maia feeds on Populus, Salix, and mesquite (Prosopis julifiora). 2 The following notes apply to the lighter 

 greenish and yellowish larvae, which are those of H. artemis: 



June 15, 1891: A good number on Salix longifolia in the Alameda. Fully grown or nearly so. Migrating. 



June 24, 1891: Several specimens on Populus fremontii in Alameda. Nearly and quite fully grown. 



June 30, 1891: Three more on Populus in Alameda. Nearly grown. None on Salix where they were found June 15. 



May 22, 1892: A number found on a large tree of Salix (not S. longifolia), about 3 miles south of Mesilla. Yellowish 

 in color, and about half grown. 



May 31, 1892. Numerous on Populus fremontii just north of Las Cruces. Nearly two-thirds grown. 



June 13 to 15, 1892: Many larvae, from two-thirds to nearly fully grown, were found on Populus fremontii in the 

 Rio Grande bottoms between Las Cruces and Rincon, and on up the Rio Grande valley to Los Palomas, N. Mex. 



June 29, 1892: A good number found north of Winslow, Ariz., on short Salix sprouts in the bottoms of the Little 

 Colorado River. They were about fully grown, and the leaves of the Salix were entirely gone. 



1 [This was really Populus wislizenii (Watson) Sargent.] 2 [This was Prosopis glandulosa Torrey.] 



