The differences between these allied divisions are best indicated by a key. LARVAE 1. Spiracular disk with only the two long ventral lobes remaining; spiracles lacking or vestigial; abdominal segments with both dorsal and ventral welts; strictly aquatic. _Antocharia._ Spiracular disk surrounded by four or five short lobes; spiracles large and functional; abdominal segments with ventral welts only (except the dorsum of segment eight); terrestrial or semiaquatic. 2. Body moderately elongated and covered with a long dark pubescence; spiracular disk squarely truncated, surrounded by five subequal stout lobes; mentum with five subequal teeth, the lateral one of either side not conspicuously reduced. _Rhamphidaria._ Body very long and slender, glabrous; spiracular disk obliquely truncated, surrounded by four slender naked lobes; mentum with three subequal primary teeth and a much reduced lateral tooth on either side. _Dicranoptycharia._ PUPAE 1. Pronotal breathing-horns branched; aquatic. _Antocharia._ Pronotal breathing-horns not branched; semiaquatic or terrestrial. 2. Pronotal breathing-horns distinct, elongate-cylindrical. _Rhamphidaria._ Pronotal breathing-horns apparently lacking, microscopic. _Dicranoptycharia._ THE SUBTRIBE DICRANOPTYCHA A Key to the Species of Dicranoptycha LARVAE 1. Spiracular disk with the dark markings less extensive; the mark of the lateral lobes not contiguous with the spiracle or the triangular area on the disk; dorsal marking indistinct or lacking. _D. winnemana_ Alex. Spiracular disk with the dark markings more extensive; the mark of the lateral lobes suffusing the ventral inner margin of the spiracle and usually closely approximated or nearly contiguous with the triangular area on the disk; dorsal marking black, transversely rectangular. _D. minima_ Alex. Description of the Species. DESCRIPTION OF THE SPECIES 1916 _Dicranoptycha winnemana_ Alexander; Proc. Acad. Nat. Sci. Phila., pp. 500, 501; Pl. 25, fig. 12. _Larva._--Length, 20-22 mm. Diameter, 0.9-1.1 mm. Coloration varying from white to almost black depending on the nature and amount of the food eaten which shows clearly through the transparent integument. The fat-bodies likewise show through and give a white color to the larva especially after death.