26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



piiparia from decaying vegetation, MSC. New York: Ithaca, July 8, 

 1915, 4 larvae from cow manure, CU; Ithaca, July 1917, 5 larvae, 

 3 puparia from decaying rhubarb, CU; Ithaca, July 1919, 9 larvae, 

 CU. North Carolina: Rowan County, Dec. 14, 1955, C. E. Jernigan, 

 1 larva from woods trash, NCS. 



Genus Merosargus Locw, 1855 



Of the 2 species listed by James (pers. comm.) for this genus, only 

 the larvae of Alerosargus caerulifrons (Johnson) have been collected 

 to date. 



Generic characters. — As given in key to genera. 



Merosargus caerulifrons (Johnson), 1900 



Figure 151 



Description.— Puparium : length 5.6 mm (head capsule and pro- 

 thorax lacking) ; mdth 2.3 mm; head capsule similar to that of Sargus 

 lucens but differing in key characters. 



Biology. — A puparium of this species was collected from debris at 

 the base of a sqidrrePs nest. 



Material examined. — -Maryland: Linnieville, Jan. 1, 1914, R. C. 

 Shannon, 1 pupariiun \^dth head capsule detached, USNM. 



Subfamily Clitellariinae 



A study of both adults and larvae of the subfamilies Cyphomyiinae 

 and Hermetiinae (James, pers. comm.) has shown that these two taxa 

 are closely related to the Clitellariinae as defined by me (p. 13). For 

 this reason, I have combined the Cyphomyiinae A\dth the genus 

 Adoxomyia to form the tribe Clitellariini and have reduced the sub- 

 family Hermetiinae to tribal status. 



The genus Dieunjneura has not been placed in either tribe due to 

 a lack of characters, but it appears to be more closely allied to the 

 Hermetiini than to the Clitellariini. 



Subfamilial characters. — As given in key to subfamilies. 



Habitat of larvae. — ^All larvae of this subfamily are terrestrial 

 scavengers and, as such, have been reported from a great variety of 

 habitats, the most common of which is decaying organic matter. 



Tribe Clitellariini 



This tribe includes 3 genera: Adoxomyia, Cyphomyia, and Di- 

 cyphoma. Their range extends from South America through the 

 southwestern region of the United States. It is interesting to note 

 that 2 species of Adoxomyia, lata and rustica, have extended their 



