IxviiiJ ENTOMOLOGICAL NEWS 259 P. mesaensis differs principally from P. gracilior (Hoffman) as follows : -P. mesaensis is uniformly light yellow whereas P. gracilior has a crescent-shaped spot in interocular triangle simi-lar to Hadrurus hirsutus. Also, the dorsal plates of the ab-domen show widespread dark spots on both sides of the middle line, which give a blackish tint to the plates. Pectinal teeth of P. mesaensis 32/32 ; P. gracilior, 26/28. The fourth caudal segment of the male P. mesaensis is considerably longer than carapace, while in P. gracilior this segment is a little shorter than carapace. On P. mesaensis the teeth on the ventral surface of the mov-able finger truncated and uniform in size ; P. gracilior has a large basal truncated tooth and 4 smaller teeth. Caudal keels more coarsely granular in general on P. mesaensis than on P. gracilior. The Occurrence of Salmacia longipulvilli in the Hawaiian Islands (Diptera: Larvaevoridae) By PAUL H. ARNAUD, JR., Entomology Research Division, Agri-cultural Research Service, U. S. Department of Agriculture, Washington, D. C. 1 The parasitic fly Salmacia longipulvilli (Tothill) has not been recorded in the Hawaiian entomological literature, although it appears to be an immigrant species from America. It was present in the Hawaiian Islands as early as 1929. Since Sal-macia longipulvilli is similar in size to Chaetogaedia monticola (Bigot), the former has apparently been confused with monti-cola and remained undetected in collections. These two species may be separated on a readily visible struc-tural character of the head : S. longipulvilli has the facial ridges bare (except for several bristles immediately above and in as--Hoffman described only the male of the species. 1 1 should like to thank J. L. Gressitt, H. J. Reinhard, C. W. Sabrosky, G. E. Shewell, Alan Stone, and P. W. Weber for their aid and sug-gestions in this study.