380 NEW NORTH AMERICAN MELANOPLI (oRTHOPTERa) 



to below median ocellus; lateral rarinae of vertex and frontal costa showing 

 appreciable convergence at fastigio-facial angle. Eye about one and three- 

 fifths times as long as infra-ocular sulcus. Pronotum elongate, the disk 

 showing feeble constriction in the prozonal portion, the lateral margins 

 scarcely divergent on metazona; transverse sulci distinct, medio-longitudi- 

 nal carina very weak except on metazona, not distinct on prozona as in 

 usitalus, caudal margin of pronotal disk weakly obtuse-angulate produced, 

 not weakly and broadly convex, subtruncate or feebly emarginate as in 

 usitalus. Prosternal spine blunt conical. Tegmina shorter than pronotum, 

 separated by a brief interval (slightly overlapping in the series from Siski- 

 you), ovate with apices rounded. Furcula represented by two minute 

 points. Supra-anal plate slightly longer than wide (in the Siskiyou series 

 averaging distinctly longer than wide, in usitalus frequently distinctly wider 

 than long), surface weakly specialized, medio-longitudinal sulcus shallowly 

 developed in proximal two-fifths, the lateral portions of the plate rather 

 strongly concave, the lateral margins showing a trace of thickening opposite 

 the cerci, the distal surface raised in the portion between the subobsolete 

 disto-lateral carinae. Cerci heavy, somewhat over twice as long as basal 

 width, dorsal and ventral margins weakly convergent to distal two-fifths, 

 where the distal portion is bent upward, the margins there subparallel until 

 the curve into the broadly rounded apex is reached, e.xternal surface of this 

 distal portion shallowly concave. Subgenital plate conical, tapering to a 

 distinct meso-dorsal tubercle, which is very feebly raised above the other 

 portions of the free margin. 



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

 Agrees with type except in the following characters. Size much larger, 

 form more robust. Sulci of vertex and frontal costa weaker and broader. 

 Eye about one and one-third times as long as infra-ocular sulcus. Pronotum 

 with sulci and carina weaker, lateral margins of disk more divergent caudad, 

 but not as much so as is usual in this sex of usitalus. Ovipositor valves 

 slightly longer than in usitatus, with apices similarly decidedly curved. 



Measurements (in millimeters) of extremes 



Caudal 



^, Length Length width of Length Width T.,ength of 



Cr • of of pronotal of of caudal 



body pronotum disk tegmen tegmen femur 



Glendale, Oregon, 



type 18.5 4.8 2.7 4.1 2.5 10.8 



Glendale, Oregon, 



paratypes (8)... 18-19.5. 4.6-4.8 2.7-2.8 3.7-4.7 2.5-2.7 10.4-11 

 Siskiyou, Oregon, 



(7) 17.5-19.3 4-4.7 2.5-2.7 4-4.3 2.6-2.8 10.7-1 1 



9 

 Glendale, Oregon, 



allotype 29.5 6 4.1 5.2 3.4 13.2 



Glendale, Oregon, 



paratypes (6)... 26.5-28 5.2-5.8 3.7-4 4.9-5.7 3.2-3.3 12.2-13.8 

 Siskiyou, Oregon, 



(6) 23.7-28 5.2-5.7 3.9-4 5-5.8 3.4-3.9 12.S-13.7 



