192 



with femora, outwardly, a little before the apex and slightly curved in opposite 

 direction ; inwardly, at basal one-fourth, is a tuft of very long bristles, usually closely 

 united and having the appearance of a long spine; upper margin fimbriate with 

 usually a tuft of hair outwardly some distance from apex; tarsi, long, slender, a little 

 longer than tibije, 2-jointed, joint 1 very long, almost as long as tibia; joint 2, short, 

 scarcely more than one-sixth the length of 1, contracted beneath at basal third, the 

 origin of the single long, slender claw, and an accompanying bristle as with the 

 other tarsi. 



(J Ifortnal form (Fig. 18).— This is the most common form found associated with the 

 females. It agrees fairly well with the abnormal form, except as follows: Slightly 

 larger, average length from 3 to 3.1"""; joint 2 of antenute with no spine at base 

 within, joint 4 being longer ; prong-like process also longer and situated before middle 

 of joint; anterior legs short, stout, not quite half as long as the posterior legs, tibisB 

 and tarsi together not longer than femora, the latter bare, with a row of black bristles 

 beneath; tibi:e twice as as long as tarsi, covered with a short dense pubescence, with 

 two long hairs beneath; tibial spur blunt and apparently composed of a tuft of stiff 

 bristles; tarsi 2-jointed, first joint very small, second long, apical half beneath 

 emarginated, base of emargination being the point of origin of the single large claw 

 and a long black hair or bristle; middle legs very long, one-third longer than hind 

 legs, cylindrical; femora but slightly longer or not longer than tibia?, with a fringe 



Fig. 20.—Rheumatobates rileyi; 

 lann, del.). 



male larva, enlarged, 



female antenua shown at right (Helde- 



of very long hairs beneath at middle, fringe at the distal ends shorter, hairs usually 

 curved; tarsi two-thirds as long as tibiae, 2-jointed, joint 1 three times as long as 2; 

 joint 2 emargiuate beneath near middle with a single claw and a bristle ; hind legs 

 much shorter, not fimbriate beneath, femora almost straigb t, not thickened or curved 

 as in the abnormal form, and a little shorter than tibiae ; tarsi 2-jointed, joint 2 shorter, 

 only a little more than one-third as long as 1, emargiuate beneath at about one-third 

 its length for the reception of the long slender claw ; abdomen relatively longer, 

 last segment conical. It also differs somewhat from abnormal form in color, the 

 yellow marks being more variable. The pale blotch on the mesonotum sometimes 

 subobsolete or entirely wanting; head black beneath, mesosternum pale, but with a 

 large v-shaped black spot or medially black with an inversely y-shaped yellow 

 sjiot, while the venter is usually entirely black. 



Imafo 9 (Fig. 18). — Readily distinguish from $ as follows: The antennae are 

 always slender, without spines or processes; joint 3 furnished with long hairs; joint 



