298 PROCEEDINGS OF THE ACADEMY OF [May, 



species of Miogryllus) or are greatly reduced, though perfect and 

 concealed by the tegmina^ (when greatly reduced in Miogryllus, the 

 wings constitute small rounded flattened pads, not folded as in the 

 macropterous condition, and may be termed vestigial rather than 

 reduced). The transverse veins of the male tegmina are normally 3, 

 sometimes 4 (particularly in some South American series where this 

 number is the normal), rarely 5, and very rarely 2 or 6; the speculum 

 is broadly ovate, liut somewhat variable in outline, with normally a 

 curved vein dividing it into nearly equal sections. The number of 

 branches of the mediastine vein is variable in the present species and 

 useless as a specific character. The caudal tibise have the dorsal 

 margins armed normally with 6 or 7 heavy rigid spines (the number 

 of these spines is seldom 5, except in a very few series and very rarely 

 8 or more^), the distal spurs are 6 in number, the medio-external, 

 medio-internal and dorso-internal being decidedly the longest, of 

 which the medio-internal is normally slightly longer than the others, 

 equalling slightly more than k to f the length of the metatarsus. 

 The male titillatores are very different from those found in either 

 Gryllus domesticus or Gryllus mitratus, with which species we have 

 alone been able to make this comparison. This organ is found 

 within the subgenital plate of the males of this group and constitutes 

 the repository of a small globular seminal sac which rests upon the 

 subgenital plate, but is enveloped laterad and dorsad by the thin 

 but corneous organ, the parts of which afford the diagnostic features 

 described below. This corneous portion constitutes a thin complex 

 plate, semi-circular in transverse section and composed of a medio- 

 dorsal and two lateral parts. The first of these is produced mesad 

 in an upcurved, rather narrow, triangular plate, with margins weakly 

 convex and with length nearly U times the basal Avidth. The 

 lateral, nearly perpendicular, portions are fused with this portion 

 dorso-proximad and are produced in shorter, narrow, vertical and 

 blunt projections, inside of which from their proximal point of 

 juncture with the dorsal portion extends on each side a single finger- 

 like projection which is also corneous and is slightly curved tow^ard 

 the apices of the lateral projections which it almost reaches. (See 

 Plate IV, figs. 8 and 9.) 



The coloration and color pattern is discussed below^ under the 

 treatment of the varietal developments. 



^ This is carefully discussed and figured by Lutz, The Variation and Correla- 

 tion of Certain Taxonomic Characters of Gryllus, p. 8. (1908.) 



" In one specimen before us of the personatus variant, the dorsal margins of the 

 caudal tibise are irregularly armed with 10 and 12 spines. 



