198 PROCEEDINGS ENTOMOLOGICAL SOCIETY A NEW SPECIES OF TACHINID^ FROM PORTO RICO. (Plate X.) BY W. R. WALTON. The tachinid parasites on the adult beetles of the genus Lachnosterna so far as recorded seem to be confined to two genera, namely, Cryptomeigenia B. & B., and Eutrixa Coq. Although the above-named genera have been widely dissoci-ated in all the tables classifying the family, they are not dis-similar in general appearance, though varying in size, and may well be much more closely allied than has generally been acknowledged. But two species, belonging to each of the genera before mentioned, have hitherto been recorded as b ing parasitic on the adults of Lachnosterna, the habits of the remainder of the species included being as yet unknown to science. The hitherto known are Eutrixa exile Coq., and Cryptomeigenia theutis Walker, the host of which is mentioned below. One other North American species, namely, Mi-crophtalma disjuncta Wied., is known as a larval parasite of "May beetles." This was reared from a larval skin of Lach-nosterna arcuata by Mr. Theo. Pergande, October 5, 1891. Microphthalma occurs also in Europe, where it will probably be found to parasitize the larva of Melolontha. The genus Cryptomeigenia was. erected by Brauer and Bergenstamm 1 in 1891 from a single male specimen col-lected in Brazil and which they called sett fades ; although Walker 2 had previously described a species, namely, theutis, under the old genus Tachina; it was evidently overlooked by the authors of the genus. The late Mr. D. W. Coquillett was, it seems, the first person to n cognize this species as being :ongeneric with seti fades B. & B., and we find it referred to its proper place in his indispensable "Revision of the North American Tachinidse." Brauer and Bergenstamm's descrip-tion of Cryptomeigenia setifacies is in a large degree unsatis-factory because of its lack of specific detail, but since it disagrees in some important particulars with several specimens in hand, and as it is impossible for the author to see the type, a new species is herewith proposed for their reception, which is called aurifacies. This is obviously distinct from theutis of Walker, which is known as a parasite of Lachnosterna in the northern United States, having been reared from an adult of Lachnosterna inversa Horn, by Mr. Theodore Pergande, at Washington, D. C., in 1892. 'Zweiflug. des Kaiser. Mus., v, 331, 1891. 2 List, iv, 228.