SCUDDER ON FOSSIL INSECTS. 749 



tuale forceps, is plainly to be referred to this genus, is judged, from its 

 size, to belong to this species, none of the characteristic parts of the uen- 

 ration being preserved. The body is a very little smaller than in the fe- 

 males of this species, and the male forceps are ovate and rather large. 

 Length of body without forceps 4.5""" ; forceps 0.35""" ; breadth of one 

 of them 0.2""". On the same stone with this is a leg which probably be- 

 longed to it, though some distance from it ; the length of the femur is 

 5"""; tibia 4.5""" ; the tarsi are broken. 



Dicranomyia rostrata, — A single specimen, larger than the other spe- 

 cies of Dicranomyia^ and about the size of Tipula decreinta Scudd., is pro- 

 visionally referred to this genus. The head is very small, the thorax 

 rather robust and very strongly arched, and the abdomen shows it to be 

 a female. The anteunal joints are fifteen in number, the basal one stout, 

 tlie apical slender obovate, the others globular; the palpi are four-jointed, 

 the last three joints equal, and together as long as the first, the whole 

 rather longer than the head, and therefore rather long for a Dicranomyia. 

 The legs are wanting, the single wing detached, broken at the base, and 

 longitudinally folded. Such of the neuration as can be disentangled 

 agrees wholly with the peculiarities of this genus. Length of fragment 

 of body, without head, G"""; breadth of head 0.5'"="; length of antenna^ 

 2.nm . p^]pi 0.9""". Fossil Canon. 



A second specimen is referred to this species, but with some doubt, as 

 it only consists of a trunk, with no appendages, excepting the male for- 

 ceps. The specimen is slightly smaller than the female, as we should ex- 

 pect, and the plates at the extremity of the body differ from those of 

 the other fossil species described in being of a regular, short, obovate 

 form. Length of body, without forceps, 6.25™"; of forceps O.G""" ; width 

 of same 0.2S"^"\ Fossil Canon. 



Sinladomyia {n-OA:^ :>-'->~-'^)i nov. gen. 



This genus is founded upon a peculiar form of fly allied to Dicranomyia. 

 The palpi are no longer than the head ; the thorax is comparatively slen- 

 der, the legs very long and slender, and the wings shaped mnch as in 

 Dicranomyia, with a i)eculiar neuration. The auxiliary vein terminates 

 some way beyond the middle of the costal border ; the first longitudinal 

 vein terminates in the second, close to the tip of the wing; the second 

 originates from the first beyond the middle of the wing, but some dis- 

 tance before the tip of the auxiliary vein ; the third longitudinal vein 

 originates from the second, near the middle of its course, beyond the tip 

 of the auxiliary vein ; a little distance beyond its origin, but much 

 nearer the tip of the wing than usual, it is connected by a cross-vein 

 with the fourth longitudinal vein; the first and second posterior cells 

 are therefore very short; there is, then, but a single submarginal cell, 

 three, or, if a very slight fork at the apex of the posterior branch of 

 the fourth longitudinal vein be counted, four posterior cells, and no 

 discal cell. 



