Vol. X] HEBARD—A NEW GENUS AND SPECIES OF GRASSHOPPER 73 



Generic description : Size medium small, form extremely ro- 

 bust for the Acridinae. Head large ; face vertical ; vertex wide, 

 its surface weakly concave and showing a subobsolete medio- 

 longitudinal carinula, its lateral margins slightly raised and 

 carinate; lateral foveolas not visible from above; frontal costa 

 decidedly concave throughout between the strong lateral 

 carinae. Eye rounded, scarcely deeper than broad, more nearly 

 circular in outline than in Stirapleura and much less elongate 

 than in any of the other genera here discussed. Antennae short, 

 moderately heavy, flattened. Pronotum with a distinct and 

 percurrent medio-longitudinal carina, cut only by the principal 

 sulcus; disk bounded laterad by distinct but irregular carinae 

 which are weakly convex-convergent to first sulcus, thence 

 straight and strongly divergent. Caudal margin of lateral lobes 

 and of each half of disk broadly concave, so that the pronotum 

 is roundly produced at each shoulder and more strongly so 

 mesad on the disk. Tegmina represented by large lateral pads. 

 Ovipositor very short. Interspace between metasternal lobes 

 of female slightly over twice as broad as long. Dorsal surface 

 of caudal tibiae with eight to ten spines on external margin. 

 Internal spurs of caudal tibiae heavy, the ventral spur being 

 only slightly longer than the dorsal. 



Esselenia vanduzeei, new species 



We refer to the figure of this distinctive insect, as we know 

 of no other species showing sufficiently close agreement to 

 enable us to make a brief comparative analysis. 



Type: Female, No. 736, Museum California Academy of 

 Sciences; Bryson, Monterey County, California, April 27, 

 1917; E. P. Van Duzee, collector. 



In addition to the characters described in the generic treat- 

 ment, we would note the following : Lateral bounding carinae 

 of vertex straight, very narrow and diverging from the sharply 

 rounded apex, forming nearly a right angle, to a point above 

 the lateral ocelli ; thence, for an equal distance, straight, broader 

 and moderately converging to the point where they disappear 

 into the rounded occiput. 



Cephalic margin of pronotal disk weakly convex, appreciably 

 less than one-half the distance between the extremities of the 

 caudal margin ; least width of disk about four-fifths the cephalic 

 width. Surface of pronotal disk weakly tectate, moderately 



