2 PROC. ENT. SOC. WASH., VOL. 20, NO. i ; JAN. mis THREE HUNDRED AND SIXTH MEETING, OCTOBER 4, 1917. A REVISION OF THE DIPTEROUS FAMILY CLUSIODIDAE (HETERONEURIDAE) . J. R. MALLOCH. During the last three years I have collected a large amount of material in this small and interesting family, and finding some new or rare forms and the early stages of one species I consider that a short revision of the whole may be of value to students of Diptera. I had purposed including the matter in the present paper in a comprehensive treatise of the Cyclorrhapha, but find that such course is not possible because of the limited facilities for publica-tion that are at present available, and in order to limit the size of my subsequent paper I now present this revision. The family name has recently been changed to comply with the rule of priority, Heteroneura, a preoccupied name, having been supplanted by Clusiodes. Family Clusiodidae. Family Characters. Larva. Musciform; the head rudimentary consisting of 2 small yel-lowish downwardly directed projections, and without a chitinized internal skeleton; thoracic segments tapered anteriorly; apical abdominal segment slightly rounded; each spiracle on a raised chitinized bifid plate. Puparium. Rather slender; rounded at both extremities; metathoracic spiracles not developed; posterior spiracles as in larva. Imago. Head broad, eyes widely separated; orbits with 3 pairs of strong bristles; vibrissae well developed; antennae of moderate size, third joint not much elongated, generally little longer than broad; arista pubescent or densely hairy ; f rons often with a pair of cruciate frontal bristles. Tibiae usually with distinct preapical dorsal bristle. Cross veins of wings closely approximated except in Clusia, 9 auxiliary vein complete; first vein falling much short of wing-middle; basal cells complete; sixth vein not extending to margin of wing. Habits of Larvae. The larvae live in decaying wood and are very sluggish in habit . Some European species have been recorded as leaping, but I saw no indication of such activity upon the part of the larvae Iliad
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