MORGAN HEBARD 273 



Eyes rather small, about as long as infra-ocular sulcus. Pronotum rather 

 short, scarcely broader caudad than cephalad, with a medio-longitudinal carina 

 weakly defined on prozona, well defined on metazona and dorsal abdominal 

 segments; transverse sulci decided; dorsum rounding into the lateral lobes but 

 with angulation indicated, not rounding evenly as in montanus, prozona quad- 

 rate, caudal margin of pronotum truncate, very feebly obtuse-angulate emar- 

 ginate. Latero-caudal angle of lateral lobes sharply rounded, slightly greater 

 than a right-angle. Tegmina and wings absent. Prosternal spine acute 

 conical and moderately slender from its broad base. 28 Interspace between 

 metasternal lobes sub quadrate. 29 Furcula represented by a pair of parallel 30 

 rounded projections, nearly one-fifth as long as supra-anal plate, decidedly 

 larger than the maximum developed in either hispidus or rainierensis. Supra- 

 anal plate elongate shield-shaped, with latero-caudal angles weakly indicated; 

 median channel broad, percurrent, moderately deep in proximal portion; 

 lateral portions rather strongly concave, the lateral margins raised and showing 

 a slight thickening opposite the cerci, but no lamellae as in hispidus and rain- 

 ierensis. Cerci distinctly over twice as long as proximal width, heavy proxi- 

 mad, tapering to distal two-thirds, which portion is slender, straight, 31 to the 

 sharply rounded apex. Subgenital plate conical with margin toward apex 

 scarcely elevated above lateral portions, apex notched and consequently bi- 

 nodose. 32 Cephalic and median femora moderately inflated and slightly 

 bowed. 



Allotype. — 9 ; same data as type. [Hebard Collection.] 



Very similar to this sex of hispidus, slightly heavier, with pronotum propor- 

 tionately slightly broader. Larger and decidedly heavier than male, agreeing 

 with that sex except in the following features. Eye about three-quarters as 

 long as infra-ocular sulcus. Antennae distinctly shorter. Pronotum distinctly 

 broader caudad than cephalad, with weak percurrent median carina cut by all 

 the weak transverse sulci, caudal margin with obtuse-angulate emargination 

 slightly stronger. Prosternal spine moderately blunt, conical from broad 

 base. 33 Ovipositor valves as in hispidus. Cephalic and median femora not 

 inflated, straight. 



28 See footnote 33. 



29 So great is the individual variation in the width of the interspace between 

 the mesosternal and metasternal lobes in many species of the Melanopli that 

 we have found these features of little or no value for diagnostic purposes. 



30 Divergent in one specimen from Banff, Alberta. 



31 In one specimen of the series showing a very feeble flexure ventrad. 



32 This varies in the present species, as in hispidus, to a condition in which 

 this feature is obsolete. In rainierensis it is obsolete, though occasionally 

 faintly indicated. 



33 In the paratypic series slightly less blunt than in the Canadian series of 

 hispidus at hand, distinctly blunter than in the allotype of hispidus from 

 Washington. The form of the prosternal spine, as of the mesosternal and 

 metasternal lobes, has been found by us to be extremely variable in certain 

 species of the Melanopli, and consequently unreliable for specific diagnostic use. 



TRANS. AM. ENT. SOC, XLV. 



