828 Charles Paul Alexander 



Pupa. — Length, about 12 mm. (cast skin). 



Labruin broad, rounded at apex. Labial lobes broadly transverse, caudal margin 

 indistinctly trilobed. Maxillary palpi large, flattened, apex bluntly pointed; a rather angular 

 tooth on margin near base (Plate XXXI, 128). Cheeks produced into flattened ledges. 

 Antennae short and stout. 



Pronotal breathing horns (Plate XXXI, 129) elongate for this subtribe, about three times 

 as long as the greatest diameter, flattened, apical half slightly expanded, margin with tiny 

 tubercles. Wing sheaths attaining base of abdominal segment 3. Leg sheaths attaining 

 base of abdominal segment 5; tarsi ending about on a level, or hind tarsi a little the shorter 

 and fore tarsi a little the longer. Abdomen with basal bands of setae on tergites 3 to 7 

 and sternites 5 to 7, and on the extreme lateral parts of sternites 3 and 4; these bands thickly 

 margined with tiny, golden-yellow hairs or points, the median part of each band naked or 

 nearly so. Male cauda (Plate XXXI, 130) with dorsal lobes (Plate XXXI, 131) very small, 

 more or less flattened, divergent, rather blunt at tips; ventral lobes elongate, contiguous 

 along inner face. 



Nepionotype. — Potomac Park, D. C, May 11, 1913. 

 Neanotype. — Cast pupiil skin, with type larva. May 14, 1913. 

 ParaUjpe. — One larva with type. 



Subtribe Dicranoptycharia 



The subtribe Dicranoptycharia, so far as known, includes only the 

 genus Dicranoptycha. The division is close to the Rhamphidaria but 

 is easily separated from it in all stages. 



Genus Dicranoptycha Osten Sacken (Gr. fork + fold) 



1818 Marginomyia Meig. Syst. Beschr. Zweifl. Ins., vol. 1, p. 147 (nomen nudum). 

 1859 Dicranoptycha O. S. Proc. Acad. Nat. Sci. Phila., p. 217. 



Larva.- — Form very elongate, terete. Integument smooth, glassy, transparent. 

 Abdominal segments 2 to 8 each with a basal transverse band or area of microscopic chitinized 

 points on ventral surface; segment 8 with a similar band on dorsum. Spiracular disk sur- 

 rounded by four lobes, the lateral pair more slender than the blunt ventral pair; dorsal lobe 

 very low or lacking; a triangular brown mark on disk between spiracles. Spiracles small, 

 widely separated. Anal gills a fleshy protuberant ring surrounding anus. 



Head capsule compact, massive, the prefrons large with a few marginal punctures; externo- 

 lateral plates very broad. Labrum large, flattened, pale. Antenna two-segmented; apical 

 segment almost as long as basal segment, gradually narrowed to the blunt tip. ]\Iandible 

 with a blunt dorsal and two blunt ventral teeth. Maxilla generalized in structure. Hjrpo- 

 pharynx a rounded cushion. Mentum deeply split behind but not completely divided, 

 with three principal teeth and a small reduced lateral tooth on either side. 



Pupa. — Cephalic crest low, depressed, setiferous. Labrum tumid. Labial lobes oval, 

 contiguous. Antennal sheaths ending opposite base of wing pad. Pronotal breathing 

 horns microseopic, represented only by tiny triangular tubercles. Meson otum unarmed. 



