36 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G3. 



pollinose; four dorsocentral macrocliaetae present; scutellum black 

 at base but in most part yelloAvisli bearing two long and one shorter 

 pairs of marginal bristles and a pair of large apicals; disk densely 

 covered with long fine erect hairs ; four sternopleural bristles present. 

 Abdomen black ; in the male the second and third segments are often 

 reddish at the sides, the second is thinly pruinose, and the third is 

 polished black except a narrow silvery band at extreme base; in the 

 female the abdomen is wholly black, the second and third segments 

 broadly silvery pollinose at base, shining on about the apical half; 

 in both sexes the fourth segment is wholly shining. Abdominal hairs 

 erect, no discal bristles. Mid tibiae bear two and usually three strong 

 bristles on the outside near the middle; hind tibiae ciliate. Third 

 vein bearing two bristles at its base. Hypopygium black, inner for- 

 ceps shorter than the outer ones, bearing a few fine hairs on the outer 

 side; when viewed in profile they are decidedly concave on the hind 

 edge, the tips pointing backward; outer forceps nearly straight, end- 

 ing in a blunt point. 



Length 5 to 7 mm. 



Redescribed from many specimens: two cotypes of Exorista 

 theclarum (Cat. No. 1421) ; numerous specimens from New England, 

 and the vicinity of Washington, D. C. ; Alameda, Santa Clara, and 

 La Jolla, California ; Mount Moscow, Idaho ( Aldrich) ; Rio Tula- 

 rosa. New Mexico (Townsend) ; Botfly Canyon, Pima Mountains, 

 Arizona (Townsend). The European specimens determined by 

 Brauer and Bergenstamm, mentioned by Coquillett as the basis of 

 his determination, are not now in the National Museum. Among 

 other localities in literature are Iowa (Townsend), Kansas (F. H. 

 Snow), and Montreal (Winn and Beaulieu). Coquillett reported 

 the species breeding on Gloveria howardi Dyar and Brephidium 

 exile Boisduval and his manuscripts add Heodes thoe Boisduval at 

 Ottawa, Canada, by Jas. Fletcher, and Lycaena mdissa at Fort Col- 

 lins, Colorado, by C. P. Gillette. Cockerell has bred it from Brys- 

 h idium exile Boisduval in the Mesilla Valley, New Mexico ; Scudder 

 reported it from Strymon calanus Huebner without locality; Rein- 

 hard reared it from StryTnon melinus Huebner in Texas; Bezzi has 

 given the European bibliography, including 14 synonyms by Des- 

 voidy and some host records, in the Palaearctic Catalogue (vol. 3, 

 p. 241). 



ZENILLIA FRONTO Coquillett. 



Exorista fronto Coquillett, Revis. Tachin., 1897, p. 96. 

 Front of male 0.309 of the head width, the sides of same gray 

 pruinose, thickly beset with short black hairs, front rather promi- 

 nent at base of antennae; face gray pruinose, the ridges weakly 

 bristly nearly one-half way; bucca one-fifth the eye height; palpi 

 yellow; antennae black, as long as the face, the third joint of male 



