NO. 3569 SOLDIER FLY LARVAE — McFADDEN 17 



Habitat of larvae.^ — -The few records available indicate that the 

 larvae live imder the bark of trees and in rotting logs. 



Key to Genera of Xylomyinae 



Prothoracic segment of larva with a tubercle anterior to the spiracle giving a cleft 

 appearance to margin (fig. 10) ; apical abdominal segment with a transverse row 

 of tubercles on dorsum Solva Walker 



Prothoracic segment of larva lacking cleft appearance of margin; no tubercles pres- 

 ent on dorsum of apical abdominal segment Xylomya Rondaiii 



Genus Xylomya Rondani, 1861 



Of the 7 species listed by James (pers. comm.) for this genus, the 

 larvae of only 2 species have been collected and 1 lacks a specific 

 determination. 



Generic characters. — As given in key to genera. 



Xylomya americana (Wiedemann), 1821 



Figures 149, 150 



Description.— Pupariiim: length (head capsule lacking) 15.2 mm; 

 width 4.1 mm. Other characters as given in key to genera. 



Biology. — Larvae of this species were removed from a hole in a 

 sycamore tree. 



Material examined. — Virginia: Alexandria, Oct. 14, 1951, W. W. 

 Wu-th, 1 puparium (USNM). 



Xylomya species 



Figures 7, 11, 25 

 Description. — Mature larva: length 13 mm; wddth 3.2 mm. Other 

 characters as given in key to genera. 



Biology. — No data available for this species. 



Material examined. — Massachusetts: Amherst, 1945, M.E.S., 1 

 larva, MSC. 



Genus Solva Walker, 1860 



James (pers. comm.) lists 3 species for this genus but the larva of 

 only 1 species, Solva pallipes (Loew), has been collected. 



Lindner (1938) and Hennig (1952) include the species of Xylomya 

 in this genus, but Steyskal (1947) has demonstrated that the adults 

 of these 2 genera can be distinguished. This shows that the immature 

 stages can also be differentiated. 



Generic characters. — As given in key to genera. 



Solva pallipes (Loew), 1863 



Figures 8-10, 12-14 

 Description.— Mature larva: length 7-8 mm, mean 7.8 mm; width 

 1.75-2.0 mm, mean 1.85 mm. Other characters as given in key to 

 species. 



221-533—67 2 



