300 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



Length of body, male, 15.25 mm., female, 23 mm.; antennae, male, 

 10 mm., female, 8.5 mm.; tegmina, male, 19.5 mm., female, 20.5 inrn.j 

 hind femora, male, 11 mm., female, 12.25 mm. 



Two males, 3 females. Cape St. Lucas, Lower California, J. Xautus; 

 Sonora, Mexico, C. A. Schott. 



91. MELANOPLUS CANONICUS, new species. 

 (Plate XX, fig. I.) 



Luteo-testaceous with a distinct ferruginous tinge. Head a little 

 prominent, flavo-luteous, below with a slight olivaceous tinge, above a 

 little streaked with fuscous and, in the male at least, with a dark fus- 

 cous postocular band; vertex a little tumid, a little elevated above the 

 pronotum, the interspace between the eyes rather narrow, equal to 

 (male) or a little exceeding (female) the width of the basal antennal 

 joint; fastigium rather strongly declivent, deeply (male) or shallowly 

 (female) sulcate throughout; frontal costa rather prominent above, 

 straight on a side view, just failing to reach the clypeus, equal, a little 

 broader than the interspace between the eyes, feebly sulcate at and 

 below the ocellus, punctate above, biseriately in the male; eyes pretty 

 large, rather prominent in the male, distinctly longer than the infra- 

 ocular portion of the geuae; antennae luteous, as long as the hind 

 femora in the male. Pronotum subequal, feebly expanding on the 

 metazona, the disk feebly convex and passing by a broadly rounded 

 shoulder into the subvertical lateral lobes, which in the male are 

 marked on the upper half of the prozona by a slightly mottled, glis- 

 tening, brownish fuscous band; median carina distinct on the metazona, 

 obsolete on the prozona; front margin subtruncate, hind margin obtus- 

 angulate; prozona feebly longitudinal (male) or quadrate (female), 

 slightly longer than the closely punctate metazona. Prosternal spine 

 rather short, conical, erect, anteriorly appressed ; interspace between 

 mesosternal lobes more than twice (male) or nearly twice (female) as 

 long as broad. Tegmina a little surpassing the hind femora, moder- 

 ately slender, gently tapering, brownish fuscous, sometimes with a fer- 

 ruginous tinge, more or less feebly flecked with obscure maculae in the 

 discoidal area; wings pellucid, very faintly iufumated, the veins black 

 or blackish fuscous. Fore and middle femora of male feebly tumescent; 

 hind femora luteo-testaceous, bifasciate with pale fusco ferruginous 

 above, the outer face feebly infuscated, the lower face luteous, the genic- 

 ular arc blackish fuscous; hind tibiae very pale glaucous, pallescent 

 basally, the spines black in their apical half, ten to twelve in number 

 in the outer series. Extremity of male abdomen a little clavate and 

 recurved, the supraanal plate longer than broad, tapering at first 

 slightly then rapidly, the apex obtusangulate except for a slight pro- 

 duction, the surface nearly plane, the median sulcus slight and incon- 

 spicuous; furcula consisting of a pair of adjacent flattened plates, 

 very broad on basal third, then rapidly contracted, and continuing on 



