942 Charles Paul Alexander 



Pronotal breathing horns (Plate LXXVII, 415 and 410) 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 LXXVII, 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 stro: 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 lolje slender. 



Neanotype. — Larned, Kan.sas, August 1, 1917. 



Genus Rhabdomastix Skuse (Gr. rod + lohip) 



1889 Rhabdomastix Skuse. Proc. Linn. Sac. 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) Jlava (Alex.) 



1911 Sacandaga flava Alex. Ent. News, vol. 22, p. 351-352. 



Rhahdomasiix flava is a curious fly which is apparently related to 

 Gonomyia l)ut represents a quite different offshoot of the Eriopterini. 

 The writer believes that the larvae might be found in moist earth along 

 streams, but at present they are quite unknown. The following notes 



