II J- I "M 



THE NEW MEXICO EANGE CATF.RI'ILLAB. 



89 



Tachina mella Walk. 



Between July 17 and the middle of August, 1009, many Hemileuca larva- wen- 

 found to be infested by the eggs of a dipterous parasite. These eggfi were never do- 

 posited on the smaller forms of these larva?, but always on those nearly full grown. 



Fig. 48. — Chalets ovata: a, Pupa; b, parasitized pupa of tussock moth (Hcmerocampa leucostigma); c, adult; 

 d, same, in profile; e, pupal exuvium. Enlarged. (From Howard.) 



They were, in nearly every instance, deposited on the sole of the prop-foot, within the 

 crescent of hooklets with which these feet are armed, a few eggs being found attached 

 laterally to the thorax. 



PlO. 49. — Pimpla san<jiiiiiip<s: Adult. Enlarged. (Original.) 



A largo number of these infested larva- were placed in confinement, and the adult 

 fly secured. The Bpeciea has boon determined by Mr. D. \Y. Coquiiletl as Tachina 

 mella Walk. (See I'm. 51.) 



These Hies seemed to bo well distributed over the range, but in very small numbers. 

 judging from (he scarcity of the eggs that wore found. 



