CANADIAN FOSSIL INSECTS. 23 



Telmatrechus stall. 



Hygrotrechus stall Scudd., Rep. Progr. Geol. Surv. Can., ISYV-'/S, 

 183-184B (]879). 



Telmatrechus stali Scudd., Tert. Ins. N. A., 351-353, pi. ii, figs. 

 11, 12 (1890). 



The thorax seems to be shorter than in Hygrotrechus, with the 

 limits of the prosternum more visibly marked from above ; the eyes 

 do not appear to be so prominent, and the first antennal joint would 

 seem, from the position of the others, to be shorter than in Hygro- 

 trechus. The insect is about the same size as our S. remigis (Say). 

 The head, as seen on a side view, is small and rounded ; thorax 

 minutely scabrous like the head, narrowing rather rapidly and 

 uniformly, the posterior limit of the prosternum marked by a slight 

 depression next the anterior coxse, the whole thorax considerably 

 longer than broad. Abdomen tapering, the apical angles of the 

 sixth segment produced to a sharp but short spine, reaching the 

 middle of the succeeding segment. Antennae nearly (perhaps quite) 

 as long as the head and thorax together. Fore femora equal, stout, 

 as long as the thorax ; fore tibiae of the same length ; middle and 

 hind legs very slender ; middle femora considerably more than twice 

 as long as the fore femora, the tibiae nearly three times as long as the 

 fore tibisB and of the same length as the hind femora ; hind tibiae a 

 little more than twice as long as the fore femora ; first joint of hind 

 tarsi about one-fifth the length of the hind tibiae. On one of the 

 specimens, preserved on a dorsal view, a line is seen proceeding from 

 either side of the thorax, directly in front of the middle coxae, arid 

 passing toward and nearly to the middle of the hinder edge of the 

 second abdominal segment with some distinctness, accompanied on 

 the second and third segments by other lines which seem to indicate 

 the veins of the tegmina, the first-mentioned line being the sutura 

 clavi ; but all trace of lines is lost beyond the third segment, as if the 

 wings did not extend over more than half the abdomen ; on the 

 specimen preserved on a side view, they appear to extend to the hind 

 edge of the sixth abdominal segment. Attached to the posterior 

 extremity of the abdomen is a pair of stout lappets, nearly straight, 

 but curving slightly outward, equal, about twice as long as broad, 

 rounded and very slightly produced at the tip. 



In a specimen (No. 70) which I have considered" an immature indi- 

 vidual of this species, but which may possibly be a Metrobates, the 

 middle and hind femora are of equal length. 



