MORGAN HEBARD O^ 



The present species has been twice incorrectly recorded as I. 

 consobrina Saussure, by Rehn in Baker, and by Rehn and He4^ard, 

 while the California males included with the original description of 

 /. iiotJia by the latter authors, are here correctly referred to the 

 recessive color condition found in the present species. 



Great variation is found both in size and color in this species, 

 due probably to environmental conditions and, particularly, to 

 the effect of different degrees of aridity. 



The males showing intensive coloration are much darker than 

 this sex of any other solidly colored species of the genus. They 

 agree with P. boUiana in the normally very decided pronotal sulci, 

 while the head is also darkened even in the palest examples. The 

 gland de\-elopment of the median segment is distinctive, the near- 

 est similarity being found in P. zebra. The supra-anal plate sug- 

 gests a further development of the type found in P. notha. 



The female shows nearest resemblance to that sex of P. bolliaua, 

 but is readily separated by the features discussed under that 

 species. 



Description of .l/a/c— (Pasadena, California.) Size rather small, form slender. 

 Interocular space about as wide as the space between the antennal sockets. Ocelli 

 not strongly defined, so that the space between the antennal sockets is very slightly 

 wider than that between the ocelli. Area between eyes and ocelli weakly con\-ex, 

 much as in P. desertae, but microscopically roughened, with more pronounced pits. 

 Pronotum and discal sulci much as in bolliaua, but with point of greatest width 

 slightly more caudad. Tegmina and wings normal, fully developed. Wings with 

 distal branches of discoidal vein longer and with more forks than is usual in boUiana 

 or desertae; ulnar \ein (in series) with three to five incomplete and four to six com- 

 plete rami. Median segment with a small, quadrate, mesal tuft of agglutinated 

 hairs; other dorsal segments unspecialized. Supra-anal plate deplanate, declivent 

 distad (or with meso-distal produced portion decidedly deflexed),"^ about twice as 

 broad as long, lateral margins weakly convex-convergent to within cereal bases, 

 then concave-convergent to broadly rounded apex. Cerci elongate, tapering rather 

 evenly to apex, with (normally) eleven distinct joints, i^o Genital hook situated 

 sinistrad, a sharply recurved, chitinous process, with recurved portion moderately 



"^ From the material at hand, it appears that this portion of the plate can, in life, be 

 deflected at will by the insect; dried specimens, showing a strong deflection, led Rehn and 

 Hebard to assign them incorrectly to notha, in which species a constant deflection of the 

 median portion of the plate apparently occurs. 



1-" The usual variation in number of apparent cereal joints occurs in the species; one 

 male before us has but nine distinct cereal joints on each side. 



MEM. AM. EXT. SOC, 2. 



