250 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



wider posteriorly; they stand on a common tubercle; the S. E. are also placed 

 on the sides of a tubercle and are slightly separated from each other; man- 

 dibles robust and parallel; maxillae and labium as usual; sternum small, shield- 

 like, somewhat redrawn from the coxae, with a prominent tubercle opposite 

 the coxae; abdomen subcylindrical with only two pairs of spines at the pos- 

 terior extremity; legs, fourth pair longest. 



A few specimens; Calmalli Mines, Sierra San Nicolas, 

 and Mazatlan. 



145. Acrosoma militaris Fabr.? — Two specimens from 

 Margarita Island appear to belong to this species. 



146. Acrosoma rugosa Hentz. — Many from Tepic and 

 Orizaba. A large variety. 



147. Acrosoma mitrata Hentz. — One specimen; Tepic. 

 Larger and darker than usual. 



148. Acrosoma 12-spinosum Cambr. — One specimen; 

 Tepic. 



149. Mahadeva verrucosa Hentz. — Several specimens 

 from Tepic. 



150. Plectana stellata Hentz. — Two specimens; Tepic. 



151. Gea heptagon Hentz. — A few specimens from San 



Jose del Cabo. 



152. Ordgarius obesus, sp. nov. 



Plate XV, Fig. 9. 



Length of 9 15 mm.; breadth of abdomen 15 mm. Cephalothorax dull 

 yellowish brown; legs paler, uniform; sternum brownish, a little yellowish in 

 center; abdomen yellowish, with golden lines coming up on the sides, four 

 indented dark spots, the anterior pair in a yellow region, base of abdomen 

 mostly grayish and extending behind in the middle, more or less broken up 

 with yellow. Cephalothorax elevated, pars cephalica spinulated, two prom- 

 inent elevations behind, truncate at tip and terminated at each corner by a 



