346 



such bristles on dorsum, and 6 on venter, the latter series not straight 

 and the median two much more widely separated than the others, the 

 outer one on each side considerably proximad of the others and less 

 noticeably clavate ; apical segment with dorsal armature as in Figure 

 i, Plate XLIX; the anal opening unf ringed; respiratory chamber 

 small, the opening oval. 



The foregoing description was made from a specimen submitted 

 along with a larva of Microchrysa polita, and under the same name, 

 by J. A. Hyslop, from Hagerstown, Md. The label indicates that the 

 larvae were feeding upon an arctiid pupa. 



Principal Papers on North American Stratiomyiidae 



Hart. C. A. 



'95. On the entomologv of the Illinois River and adjacent waters. 

 Bull. 111. State Lab." Nat. Hist., Art. VI, 4:247-266. 



Johnson, C. W. 



'95. Review of the Stratiomyiae and Odontomyiae of North Ameri- 

 ca. Trans. Am. Ent. Soe., 22 : 227-278. 



Malloch, J. R. 



'15. A revision of the North American Pachygasterinae with un- 

 spined scutellum. Ann. Ent. Soc. Amer., 8 : 305-320. 



Melander, A. L. 



'03. A review of the North American species of Nemotelus. Psyche, 

 10 : 171-183. 



Family XYLOPHAGIDAB 



There can be no doubt that the species herein included should con- 

 stitute a distinct family. The larvae differ from those of Strat- 

 iomyiidae and Leptidae in many respects, and the pupae also are suf- 

 ficiently distinct to entitle them to rank in a distinct family. 



Without a knowledge of the immature stages of Rhacicerus and 

 Arthropcas I do not think it advisable to give a definite opinion on 

 their family status. Brauer in 1882* placed them in Xylophagidae 

 on characters possessed by the imagines. By the use of the same 

 characters he placed Xylomyia (Subula) also in this family, but sub- 

 sequently, in the same publication (1883), he transferred it to 

 Stratiomyiidae because of the characters of the early stages. It will 

 probably be best to retain the two genera in question in Xylophagidae 

 pending further knowledge as to their early stages. Brues and 



*Denkschr. k. Akad. Wissensch. Wien, math.-naturw. CI., Vol. 44, p. 86. 



