32 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



abdominal hairs. Legs brownish, mid tibiae bearing two bristles 

 on the front side near the middle ; hind tibiae ciliate with one large 

 bristle at middle of row. Hypopygiiim brownish to black, innei 

 and outer forceps long and of even length, the former straight, par- 

 allel, except at the apex where they diverge somewhat. When 

 viewed from behind the inner forceps appear fused for two-thirds 

 their length. 



Length 8 to 10 mm, 



Redescribed from a large series; one European specimen deter- 

 mined by Brauer and Bergenstamm as Parexorista cheloniae; many 

 reared at the gypsy moth laboratory, Melrose Highlands, Massachu- 

 setts, from Malacosoma americana Fabricius ; two Soldier's Summit, 

 Utah (Aldrich) : Tempe, Arizona (Caffrey) ; Linnieville. Maryland 

 (Shannon) . It appears that some of Coquillett's material was trans- 

 ferred to other species after 1897, as we do not find all his localities 

 in the collection, nor specimens connected Avith the hosts he men- 

 tioned. Tothill records it from Apantesis 07'nata Packard at Kaslo, 

 British Columbia; Malacosoma disstria Huebner at Fredericton, 

 New Brunswick, and at Ottawa ; and from Phragmatohia assimilans 

 Walker at Hymers, Ontario. 



Coquillett added a note in his manuscripts that the species was 

 reared from Cacoecia argijrosipila Walker at Canyon City, Colorado, 

 by J. B. Gill; and Walton's manucript list of Tachinid hosts records 

 it from TuTuiMana permaculata Packard at Fort Collins, Colorado, 

 by Professor Gillette. 



The biology of the species is somewhat confused. Howard and 

 Fiske state that it attacks the brown tail moth in Europe, but not 

 in the United States; and even imported strains adopt the habit of 

 the American in this regard, which they suggest results from cross- 

 ing. Townsend quotes Pantel that the fly lays a pediceled Qgg^ upon 

 the host, containing an incubated larva; but adds that in his own 

 work at the gypsy moth laboratory the eggs were unincubated. The 

 fact that the American specimens do not attack the brown tail moth, 

 he says, proves them a distinct species, even though no anatomical 

 characters have been found. 



ZENILUA RECLINATA, new species. 



Front of male 0.22 to 0.25 (in three) and in the female 0.28 to 0.30 

 (in three) of the head width; silvery, blackish at vertex, the sides 

 clothed with numerous short black hairs; parafacials silvery, at the 

 narrowest part less than the width of the third antennal joint; palpi 

 yellow ; bucca linear, about one-twelfth the eye height ; facial ridges 

 bristly on the lowest fourth; antennae somewhat shorter than face, 

 the third joint in both sexes two and one-h'alf times the second, arista 



