28 



THE CANADIAN ENTOMOLOGIST. 



of which the last have become peculiarly specialized, having the tarsi 

 slender or thread-like, and divided into a large number of short segments, 

 being antenniform rather than like ordinary legs. Claws are normally 

 absent from these last tarsi ; but an individual has been found in which 

 claws are present, this case probably representing an atavism to the more 

 general Cryptops-like form from which specialization has proceeded in the 

 group. In Newportia there are no teeth on the inner side of the femora 

 of the prehensorial or poison feet. All the dorsal plates are marked with 

 two impressed longitudinal lines or furrows, one each side of the middle, 

 while on most of the plates there is outside of each of these an oblique 

 furrow. The first dorsal plate is characteristically marked with a trans- 

 verse furrow, which in most species is angularly bent backward at the 

 middle. In some species the plate is distinctly depressed into a pit at 

 this angle in the cervical line or furrow. In about half of the known 

 species the two median furrows of the first dorsal plate bifurcate, the two 

 inner of the diverging branches running inwardly and forward and meeting 

 at the middle angle of the cervical line. A W-shaped 

 mark is thus formed. (See Fig. 2.) . 



The species of Newportia found in Utah is clearly 

 most closely related to Newportia azteca, Humb. and 

 Sauss. {spinipes, Poc), the species ranging nearest it 

 geographically. These two species differ from all 

 the others with the W marking on the first dorsal plate, 

 in having two spines at the distal end of the tibial joint 

 of the legs, and in having at the same time a ventral 

 spine below the apex of the tarsal joint. The Utah 

 species differs from azteca, among other points, in the 

 shape and proportions of the head plate and in the 

 greater length and different disposition of its posterior 

 furrows ; in lacking dental plates, and in not having the 

 anterior border of the presternum mesally deeply 

 excavated ; in having the last ventral plate more narrowed posteriorly, 

 and its posterior margin but slightly incurved ; in having the pseudo- 

 pleura of the last segment covered with numerous spinules, both laterally 

 and ventrally, among the pores, as well as along the posterior margins and 

 over the basal portion of the posterior processes ; and in the form and 

 size of the spiracles. 



Fig. 2,— Newportia 

 Utahensis : dorsal 

 view of head and 

 anterior segments. 



