ZENILLIA AND ALLIED GENERA — SELLERS 59 



Abdomen reddish yellow sparsely covered with light-gray-silvery 

 pollen (color varying to almost black with red color showing only 

 faintly; the pollen then more pronounced silvery) ; a median dorsal 

 vitta shining black (not so pronounced in the darker form), covering 

 whole depression on first segment in red forms (this segment entirely 

 black in dark forms), nearly as wide as width beneath pair of 

 marginal macrochaetae on second segment, and narrow on third seg- 

 ment (must be closely observed in red specimens to avoid wrong im- 

 pression), broadening sharply on fourth segment; ventral membrane 

 shining black; no discal macrochaetae, abdominal hairs depressed; 

 first and second segments with one pair of marginal macrochaetae 

 (pair on first segment sometimes weak or lacking in male) ; fourth 

 segment irregularly tipped with marginal and submarginal bristles 

 about one-half size of macrochaetae of marginal row on third segment. 

 Length 8 mm. 



Type locality. — Guanajuato, Mexico. 



Distribution.— District of Columbia 1, North Carolina 1, Florida 5, 

 Mississippi 1, Texas 3, Mexico 1. Published records not duplicated 

 above: Texas 2 (Eeinhard), Virginia (Coquillett), Mexico (Town- 

 send), Jamaica (Johnson). 



Hosts.— Mcgalopyge opercularis (Abbot and Smith) 9 ; M. (Lagoa) 

 crispata Packard 1 probably opercularis, Lagoa sp. 2. Coquillett 

 lists all the specimens reared from opercularis and crispata as oper- 

 cularis. Townsend reared the type specimens from M. {Lagoa) 

 opercularis. Other published rearing records are M. opercularis 

 (Reinhard, Bishopp). 



Remarks.— The foregoing description is based on an examination 

 of eight males and two females reared from Mcgalopyge opercularis 

 (Hayhurst, Neal, McMeekin, Schwarz, Turner, Spencer and Weed, 

 as listed by Coquillett) ; one female reared from Lagoa sp. (Riley) ; 

 one male reared from Lagoa sp., North Carolina; one male and six 

 puparia, host not listed, District of Columbia; one female, Federal 

 District, Mexico (Conradi) ; two specimens from Florida bearing 

 No. 3373. 



Coquillett determined 10 and possibly 11 of the foregoing specimens 

 as Exorista ftavirostris, as indicated by the characters in his key in 

 1897. This species can be recognized from Van der Wulp's original 

 description as not being E. favirostris. 



Aldrich's notes indicate that he twice examined the remnant of 

 the type specimen lagoae Townsend. The type was in very poor con- 

 dition, with the head lacking, front and hind legs gone, and thorax 

 and abdomen injured by glue. Aldrich considered the specimen to 

 be amplexa, and he refused to alter the nomenclature for such a poor 

 specimen. His examination indicated that the specimen had four and 



