428 PROCEEDINGS OF THE ACADExMY OF [June, 



Though resembhng N. maculatus closely in size and somewhat in 

 form, individuals of this race may be separated by the absence of light 

 markings on the head, immaculate and dark coloration, less sharply 

 truncate tegmina in both sexes, more shiny appearance in the males, 

 and different apex of the ovipositor in the females. 



Type: cf ;- Moose Jaw, Saskatchewan. In grass along borders of 

 draw on prairie. August 24, 1903. (Caudell) [U. S. N. M. Collection.] 



Description of Type. — Size smallest of the races of fasciatus, 

 similar to A'', maculatus in size, but form not quite so robust. Head, 

 eyes, and pronotum as in fasciatus. Tegmina not as long as the caudal 

 femur, translucent and rather abruptly rounded distad, though not as 

 sharply truncate as in typical maculatus. Wings absent. Abdominal 

 appendages and first proximal internal spine of caudal tibiae as in 

 fasciatus. Limbs as in fasciatus. 



Allotypic 9 , here selected, bears the same data as the type. 



Description of Allotype. — Size larger, but proportions much as in 

 the type. Tegmina much shorter than the caudal femur, broadly 

 rounded distad, though not as much so as in typical maculatus, 

 longitudinal veins rather conspicuous, cross veinlets faint. Wings 

 absent. Ovipositor long, longer than caudal femur, rigid, with a 

 scarcely perceptible arcuation, apex of same sublanceolate, enlarged 

 for a shorter distance than in fasciatus and more obliquely subtrun- 

 cate than in that species, with that portion formed by the dorsal 

 valves armed, the upper margin dentate, these teeth rather irregular, 

 heavy, and sharply cut. 



Fig. 5. — Xcmobius fasciatus ahortivus. Ovipositor. (Greatly magnified.) 



Measurements {in millimeters) . 



Allotype. Type. Average of paratypic series. 



9 c^ 9 9 d'd' 



Length of body 9. 7.4 8.2(7.3-9.) 7.3(6.7-8.) 



Length of tegmina 3.5 4.8 3 . 6 (3 . 1-4 . 6) 4 . 9 (4 . 3-5 . 8) 



Length of caudal femur .5.4 5.1 5 . 8 (5 . 4-6 . 2) 5 . 2 (4 . 9-5 . 5) 

 Greatest width of caudal 



femur 1.8 1.7 1.9(1.8-2.1) 1.8(1.7-1.9) 



Length of ovipositor 6.2 6.8(6.2-7.4) 



The above measurements show that when compared with the 

 smallest individuals of fasciatus, the length of the caudal femur of 



