190 



Aside from the peculiar structures of this insect it is interesting in 

 furnishing two forms of the male; a normal form departing less from 

 the family type than the abnormal form, which has characteristically 

 enlarged and spinose antennae and swollen and curved hind thighs. 

 In these two specialized characters, however, there is considerable 

 variation, in some specimens the antennie being twice as thick as in 

 others, while again the hind thigh is sometimes much less noticeably 

 thickened and curved, l)ut approaches more nearly to that of the nor- 

 mal male. 



There is also slight variation in all details, both as to coloration and 

 relative proportionof Joints, and detailed armature of legs and antenuie, 

 a fact which is brought out very strikingly by the examination of over 

 200 specimens. 



Rheumatobate.s klleyi Beigioth. Imago <? (abnormal form). — Leugth 2.2 to 3'""'. 

 Velvety black, disc of abdomen slightly pruinose; under side of head and thorax, 

 anterior coxfe, except behind, basal two-thirds of anterior femora, middle coxse 

 beneath and at base, hind coxte, basal part of hind trochanters, a central spot on 



Fig. 18. — Rheuniatobatet: rile i/i— normal male, eularged, the lower figure showing abdomen from side 

 (Heidemami, del.). 



each ventral segment on lateral margins of a])domen, basal one-third of first antea- 

 nal joint, a traasverse siibquadrate spot on pronotum and either a triangular, heart- 

 shaped, lozenge-shaped, or linear spot on mesonotum, all yellow or yellowish-white; 

 onmesopleura, some distance above middle cox;b, is an oblong darker yellow spot. 

 Head about as long as width between eyes ; tylus prominent, about as long as wide. 

 Eyes large, subglobnlar, strongly faceted, -with a tubercle beneath and furnished 

 with two or three long hairs issuing from posterior margin. Eostrum 3-jointed, 

 short, stout, acuminate at tip, and extending to between anterior coxfe ; joint 1 stout- 

 est, about as long as 3. 2 slightly longer than 1 and 3 together, acuminate. Antennse 



