984 FAMILY XXXI. — GERRID,£. 



Minn., in which there is only a trace of the usual yellow spot 

 on mesonotum and the under surface is almost wholly dark. 



1120a ( — ). Rheumatobates rileyi palosi var. nov. 



Differs from typical rileyi in having the body of male more slender, 

 yellow spot of mesonotum only about half the width of that of pro- 

 notum; tooth of apical joint of antennae situated behind instead of in 

 front of the middle of the joint; hind tibia? straighter, more slender, 

 without a tubercle on apical half and with a fringe of long hairs along 

 the entire inner side. Female with mesonotum wholly black. Length, 

 2.7 — 2.9 mm. 



Marion Co., Ind., Sept. 16 ; one pair and several nymphs taken 

 from the edge of a clump of water willows in White River. 

 Palos Park, 111. (Gerhard) ; two males, one female. Bergroth, in 

 his principal paper on the genus (1908, 381), uses the differen- 

 tial characters as set forth above as some of the principal ones 

 separating tenuipes from rileyi, but as the former species has the 

 mesosternum striped with black and the hind legs of male 

 simple, straight and hairless, the specimens above described 

 cannot be referred to it. 



1121 (1298). Rheumatobates tenuipes Meinert, 1895, 7. 



Form and size of rileyi. Color much the same, the yellow spot of 

 mesonotum narower than that of pronotum, sometimes absent; meso- 

 sternum with front margin and two longitudinal stripes blackish-brown. 

 Male with first joint of antennae more swollen, third joint with basal 

 half strongly curved, the spongy spinose fossa covering the under side 

 of apical half and preceded by a slender spine; fourth joint as long as 

 third, curved at base and apex, armed behind the middle with a strong 

 curved tooth. Macropterous form with pronotum prolonged backward 

 covering the mesonotum, its hind portion subtriangular with apex 

 rounded. Mesonotum of female not broader than long. Elytra longer 

 than abdomen, the corium, clavus and membrane distinct. Length, 

 2.8—3 mm. 



Glen Echo, Md. (Davis). Raleigh, N. C, Sept. 13— Oct. 20 

 (Brimley). Recorded heretofore only from the District of 

 Columbia. The males are easily distinguished from those of 

 rileyi by the unmodified hind femora, the females by the striped 

 mesosternum. The macropterous form is very rare. 



1122 (1298V a ). Rheumatobates trulliger Bergroth, 1915a, 63. 



Differs from its allies mainly by the characters given in key. Color 

 as in tenuipes. Mesonotum in both sexes slightly broader than long. 

 Joint 3 of antennae of male with spinose fossa occupying the apical third, 

 longer than in rileyi, shorter than in tenuipes, 4 shorter than 3, its spine 

 on basal half, but nearer to middle than base. Middle femora straight, 



