64 TECHNICAL DESCRIPTION. 



panding somewhat, the disk of the prozona sometimes ( but not always ) very 

 feebly tumid, the front margin feebly convex, the hind margin obtusely and 

 roundly angulate, more obtusely in specimens from the Pacific coast than in 

 others, the median carina distinct and sharp on the metazona, less prominent but 

 distinct on the anterior half of the prozom, still less distinct (occasionally sub- 

 obsolete) between the sulci; prozona subquadrate in both sexes, smooth, divided 

 in the middle, and barely before the middle of the posterior half, by sulci, the 

 principal sulcus bent forward in the middle by the posterior emargination of the 

 prozona, the metazona plane finely subruguloso-punctate ; lateral lobes nearly ver- 

 tical, separated from the disl by a well-rounded angle nowhere forming distinct 

 lateral carinae, marked next the upper limit on the proxoua by broken blackish 

 patches, frequently reduced to a pair of short, oblique black dashes, one in either 

 longitudinal half of the prozona, each in a clearer field, and also by the black- 

 ening of the sulci in this region. They are sometimes accompanied by slender, 

 oblique, parallel black lines lower down, the hinder the lower; the pleural incis- 

 ures are also heavily marked in black. Prosternal spine rather long, conical as 

 seen from the side, bluntly cylindrical as seen from in front, a very little retrorse. 

 Tegmina at least reaching (female) or distinctly surpassing (male) the hind 

 femora, absolutely free from maculation, the narrowest apical portion about half 

 as broad as the broadest subbasal portion ; wings pellucid or ( in darkest forms ) 

 very feebly infumated, feebly and narrowly opaque along the costal margin, the 

 veins and cross-veins mostly brownish fuscous. Fore and middle femora of 

 male heavily bullate, the hind femora stout and rather short, moderately 

 tumid, generally fulvo- testaceous, sometimes flavo - testaceous beneath, the 

 outer face with alternate, fulvo-testaceous and black, narrow, equal fish-bone 

 markings, the black rarely interrupted in the middle, the upper inner face 

 with small basal and large median and postmedian black patches, the gen- 

 icular arc black on both inner and outer sides; hind tibiae yellow or ful- 

 vous (occasionally in California bright coral red), with a postbasal narrow 

 black annulus (in dark specimens more or less infuscated beyond it), the 

 spines black to their very base, ten to eleven, rarely twelve, in number in the 

 outer series. Extremity of male abdomen heavily clavate, the supra-anal plate 

 subclypeate, obtusely angulate at apex, the margins feebly and broadly elevated 

 and the median portion correspondingly elevated and bearing on its summit a 

 moderately shallow, longitudinal sulcus, tolerably broad and subequal on the 

 basal half, narrowing and with falling walls apically; furcula completely absent 

 or indicated only by a thickening of the last dorsal segment at their proper posi- 

 tion: cerci very large and coarse, laminate, boot-shaped, the basal half subequal, 

 punctate and straight, beyond expanding and at the same time feebly bifurcate, 

 the upper fork as long and more than half as broad as the base, feebly invurved, 

 strongly upcurved, apically tapering slightly and well rounded, the lower fork at 

 right angles to it, forming only a rounded, downward and posteriorly projecting 

 lobe, so that the apical margin of the whole is deeply and roundly emarginate 

 below, the whole surpassing a little the supra-anal plate; infracercal plates 

 wholly obscured; subgenital plate short and broad, scarcely so broad apically as 

 long: the apical margin thickened, but hardly otherwise either elevated or pro- 

 longed, entire ; upper valve of ovipositor abruptly upturned apically and sharp 

 acuminate, the upper outer carina feebly serrate. 



Length of body, male 39 mm., female 41 mm. ; antennae, male 18 mm., female 

 16 mm.; tegmina, male 32 mm., female 34.5 mm.; hind femora, male 20 mm., 

 female 23 mm. Some specimens, especially from the north (Illinois, e. g.), are 

 hardly more than half this size. 



