No. 2305. ON SOME FOREST LEPIDOPTERA—HEINRICH. 81 



lected by Messrs. George Hofer and B. T. Harvey of the Bureau of 

 Entomology at Garden of the Gods and Manitou, Colorado. The 

 larvae mine the rough outer bark of the yellow pme (Pinus scopu- 

 lorura) and are evidently very common. According to Mr. Hofer's 

 and Mr. Harvey's notes the attack is confined to the living bark 

 of the main trunk of the tree near its base and no higher up than 

 six feet from the ground. Pupation takes place within the mine and 

 covers a period of slightly more than a month. The larvae in general 

 appearance closely resemble those of the Aegeriidae, and on super- 

 ficial examination might easily be so mistaken. The head characters, 

 however, are all distinctively Cossid, while the pupa is remarkably sim- 

 ilar in structure and appearance to that of Zeuzera and Cossula. As 

 far as I know nothing has hitherto been recorded on the early stages 

 of this genus. A full description of larva and pupa is therefore given. 



General characters — larva. — (pi. 7, fig. 40; pi. 10, figs. 60-64). 

 Round; stout, thickest at middle of body; 9th and 10th abdominal 

 segments sharply tapering; caudal end narrowly rounded. Cro- 

 chets evenly uniordinal, in a narrow ellipse, broken slightly at the 

 inner extremity, weak at the outer extremity. No anal fork. Pro- 

 thoracic shield small and weak, not divided. Spiracles small, round; 

 8th abdominal spiracle no larger, and prothoracic spiracle only slight- 

 ly larger than those on abdominal segments 1 to 7. Body setae 

 normal; tubercles weak; pro thorax with Ila well above the level of 

 la, foreward of llh, puncture y dhectly caudad of la, on the level of 

 Ilh, Ic, and lie closely approximate, lie caudad of 7c, III, IV and 

 V triangularly grouped, equidistant and closely approximate; meso 

 and metathorax v/ith 7/7, IV and V well separated, VI unisetose; 

 abdominal segments 1 to 7 with 77 much lower than 7, IV and V 

 closely approximate under the spiracle; 77 also lower than 7 on 

 abdominal 8; 7 of 9th abdommal lov/er than 77, equidistant from 

 77 and 777, IV and V rather well separated, VI remote from TV, 

 VII unisetose on abdominal segments 8 and 9. 



Head considerably retracted within pro thorax; small; ovoid, nearly 

 spherical; nearly square in outline viewed from above, slightly 

 constricted posteriorly; about as broad as long; incision of dorsal 

 hind margin over one-fourth the width of the head; extremities 

 of dorsal hind margins bluntly rounded, almost straight, distance 

 between them about equal to incision of hind margin. Frons triangu- 

 lar, reaching to middle of head; adfrontal ridges converging in nearly 

 straight lines to a longitudinal ridge {LR) about half as long as the 

 frons; adfrontal areas of frons (ADF) rather broad; adfrontal sutures 

 (ADFS) evenly curved reaching to incision of dorsal hind margin. 

 Projection of dorsal margin over ventral, half the diameter of the 

 head. Ocelli six, in normal Cossid arrangement with V and VI 



144382— 20— Proc.N.M.vol.57 6 



