REHN AND HEBARD 109 



est specialization in the genus, correlated as it is with the reduction 

 in tegminal length in the female. This broadening at the stridulat- 

 ing vein is accompanied by an abbreviation of the speculum and 

 a pronounced angulato-emargination of the distal portion of the 

 free margin of the field. The male sex is invariably macropterous, 

 while the female is macropterous in six species, decidedly brachyp- 

 terous in three^" (group C) and moderately brachypterous in two 

 (arachnopijga and semialata). As stated above the reduction in 

 size of the flight organs is in direct ratio to the specialization in 

 structure of the apex of the stridulating vein of the male tegmina. 

 In one of the species generally macropterous in the female (gracili- 

 pes), certain individuals approach the type of brachypterism found 

 in semialata and arachnopijga. The number of rami to the discoidal 

 vein" varies from two to six and in two species {carita and hrevi- 

 cauda) as much as from two to five. The number of these has 

 been considered diagnostic by previous authors, but our studies 

 show that as specific criteria no value can be placed on them, vary- 

 ing as they often do on the two tegmina. The number present in 

 the series of each species is treated under the respective Morpho- 

 logical Notes. Very frequently the proximal rami, and occasion- 

 ally others, are forked and the distal one of the forks has been 

 annexed by the next distad complete ramus. This is generally 

 effected through the agency of an adventitious more or less distinct 

 medio-longitudinal false nervure connecting the rami, breaking in 

 one or more places. In similar fashion the anterior ulnar vein 

 occasionally annexes the proximal discoidal rami. 



Color Pattern. — The main features of the color pattern consist of 

 more or less distinct postocular bars of whitish and purplish, con- 

 tinued over the cephalic portion of the prozona, broad edgings of 

 the same tones on the caudal margins of the lateral lobes of the 

 pronotum and narrower continuations of the same on the caudal 

 margin of the pronotal disk, and more or less decided lateral abdom- 

 inal bars of whitish or yellowish and purplish, and in certain species 

 a median one. The face frequently has distinct pale infra-ocular 

 bars, while the dorsum of the prozona and of the abdomen is fre- 



5" This sex is unknown in one of these three {limifcra), so this statement 

 is made on the basis of affinity of the male sex. 



" The proximal one of these rami is really the median vein, but as it does 

 not differ at all in character from the other rami we have counted it as one. 



TRANS. AM. ENT. SOC, XL. 



