942 CHARLES PauL ALEXANDER 
Pronotal breathing horns (Plate LX XVII, 415 and 416) flattened, earlike or very narrowly 
trumpet-shaped, with a thick marginal ridge, the disk restricted. Lateral angle of thorax 
above wing root very broad and blunt, setiferous. Leg sheaths of fore and hind legs almost 
on a level, those of middle legs shorter, ending a little beyond midlength of last tarsal segment 
of fore legs. Male cauda (Plate LX XVII, 417 and 418) with dorsal and ventral lobes very 
short and blunt, subequal in length; ventral lobes closely approximated on median line; 
dorsal lobes widely separated at their base, with two small acute points directed stror gly 
dorsad, divergent at their tips, each with two small setae on outer face near base; dorsum of 
segment 8 with five lobes, the anterior pair a little more widely separated than the posterior 
pair, the median lobe slender. 
Neanotype.— Larned, Kansas, August 1, 1917. 
Genus Rhabdomastix Skuse (Gr. rod + whip) 
1889 Rhabdomastiz Skuse. Proc. Linn. Soc. N.S. Wales, ser. 2, vol. 4, p. 828-829. 
The genus Rhabdomastix includes nearly a dozen species, some of 
which have been previously described as Gonomyiae. 
The immature stages of Rhabdomastix schistacea (Schum.) were found 
by Beling (1886:195) in wet earth beside a stream in beech woods on 
May 6. The larva measures 6 millimeters in length; the greatest diameter 
is 0.8 millimeter. The body is strongly dilated in the anterior part and 
gradually narrowed behind. The integument is deep brownish yellow. 
The spiracular disk is short and blunt, and has four very small, tuberculate 
teeth, the lateral pair lying somewhat more cephalad than the more 
powerful ventral pair; spiracles small, circular, yellowish brown, separated 
by a distance about equal to four times the diameter of one. The pupa 
has the mesonotal declivity provided with an interrupted crossrow of 
small, unequal, chitinized teeth. 
(Subgenus Sacandaga Alexander) 
.1911 Sacandaga Alex. Ent. News, vol. 22, p. 349-352. 
Rhabdomastix (Sacandaga) flava (Alex.) 
1911 Sacandaga flava Alex. Ent. News, vol. 22, p. 351-352. 
Rhabdomastix flava is a curious fly which is apparently related to 
Gonomyia but represents a quite different offshoot of the Eriopierini. 
The writer believes that the larvae might be found in moist earth along 
streams, but at present they are quite unknown. The following notes 
