GEOLOGICAL SURVEY OF THE TEEEITORIES. 435 



each row ; the posterior tibia? with each superior margin minutely ser- 

 rated and furnished with four strong spines in each row, somewhat 

 divergent and alternate, (though in many specimens they appear to be 

 sub-opposite,) the inner row extending farthest upward toward the base ; 

 ovipositor nearly straight, about as long as the abdomen 5 cerci slender, 

 hairy, one-third the length of the ovipositor ; posterior femora extend 

 nearly one-half tbeir length beyond the abdomen. 



Male. — The posterior femora armed beneath with a row of strong 

 spines on the exterior carina, the inner carina being finely serrated ; 

 cerci similar to those of the female but rather longer ; ultimate ven- 

 tral segment tumid and bilobed. 



Color, (alcoholic specimens, scarcely differing in color from the liv- 

 ing). — Pale, testaceous 5 face and labrum pale, lightest in the male; 

 vertex and occiput, in the female, minutely dotted with brown, in the 

 male, with narrow, branching, dusky veins; tubercle fuscous; eyes 

 black, acuminate below ; each thoracic and abdominal segment has ou 

 it four somewhat irregular brown spots, those on the thorax running 

 together on the disk, and those on the abdomen grov/iug smaller toward 

 the apex ; the position of these spots leaves a pale line along the dor- 

 sum and on each side; posterior femora marked with slender, brown 

 lines diagonally across the disk, and two longitudinal dashes of the 

 same near the lower margin ; spines of the tibiae white with piceous 

 points; serrature of the posterior tibiae pioeous; venter and pectus 

 white, or pale testaceous. 



Dimensions. — $ , length, .54 inch ; posterior femora, .47 inch ; posterior 

 tibire, .51 inch ; ^ , length .5 inch. 



iZaciitet— Southeast Colorado ; and east side of Black Hills, near 

 Eed Buttes, Wyoming. 



I at first referred these specimens to G. divergens, Scudd., and it is pos- 

 sible they form but a variety of that species, with which they agree in 

 several particulars. While some of my female specimens have diver- 

 gent spines, this character is by no means permanent, especially in the 

 males. The G. divergens has five spines in each row on the posterior 

 tibite, but my specimens, males and females, have but four, (1 take for 

 granted that none of the circlet at the apex are counted.) This species 

 approaches very nearly to G. zonarius, Walk., but may be distinguished 

 by the difference in the number of spines on the middle femora and mid- 

 dle tibia3. 



G. castaneus, nov. sp. 



Male. — Dorsum, castaneus ; middle tibise with two spines in front; 

 posterior tibiss with four spines in each row, opposite. Maxillary palpi 

 long ; third joint about twice the length of the two preceding taken 

 together, slightly bent, obliquely truncate; fourth three-fourths the 

 length of the third ; fifth a little longer than the third, curved and chan- 

 neled as usual. Frontal tubercle nearly obliterated. Eyes sub-pyri- 

 form, not prominent. Antennae aj^parently of moderate length, (those 

 of my unique specimen have the apical portion broken off;) they have a 

 broad, dish-like fold around the base; first joint flattened, very broad, 

 length slightly exceeding the width ; second, length equal its diameter ; 

 third, twice the length of the second ; from the middle to the end every 

 tenth or twelfth joint is constricted, forming a pale-yellow annulatiou. 

 Thoracic segments slightly margined. Cerci rather long and slender, 

 about one-third the length of the abdomen, covered with minute hairs. 

 Subanal plate abnormal, extending back more than half the length of 

 the cercij triangular and bilobed, the lobes blunt at the apex, having 



