214 THE UNIVERSITY SCIENCE BULLETIN. 



the length of the tibia, the latter equal to the claws, and 1% the length 

 of the tarsus. Length 5% to 6 mm.; width across pronotum 1% mm. 



"Types 2 (male) and 2 (female), from White Plains, N. Y., collected 

 in August and September by J. R. de la T. Bueno. Other specimens have 

 been examined from Washington, D. C. (coll. W. L. McAtee) Oglethorpe, 

 Ga. (coll. T. C. Bradley) Hadley, Mass., (coll. C. A. Frost) and Valhalla, 

 N. Y. (coll. Bueno). The species, therefore, appears to be distributed 

 pretty widely up and down the Atlantic coast of the United States. 



"Variation. Some twenty specimens have been examined in addition 

 to the described types. These individuals show a wide range of varia- 

 tion, such that the extremes would seem to belong to different species were 

 it not for the intergradation. The writer has been unable to find any 

 constant character, however, which would serve as a basis for discrimina- 

 tion. The smallest (White Plains) measures but 4^/4 mm., the largest 

 (same locality) 6% mm. The tegminal surface may be smooth and 

 polished, or dull and rastrate, the lineations varying from the regular 

 complete lines of the type to interrupted and confused markings, re- 

 sembling those of P. gillettei; the inner angle of the clavus, however, is 

 never bare of lineations. Pronotal lines 6-9, either entire or much broken 

 and confused. The index of pronotal width divided by pronotal length 

 ranges from 2.22 to 2.60 in the 5 , and 1.79 to 2.73 in the ^ ; that of the 

 head width divided by the interorbital width ranges from 2.87 to 3.57 in 

 the and from 3.60 to 4.20 in the j ; that of the head width divided 

 by the head length from 2.07 to 2.60 in the 5 and from 1.68 to 2.33 in 

 the 7 . In the male the palar pegs are sometimes crowded into two 

 rows at both ends of the series. The absence of functional wings in both 

 sexes in this genus certainly interferes with the rapid dispersal or mix- 

 ing of individuals from adjacent localities, and thus brings about a 

 partial segregation which would preserve and intensify aberrant varia- 

 tions. This possibly explains the very unusual range of variability above 

 described." 



Pabnacorixa gillettii Abbott. 



Ento. News, Vol. XXIII, p. 337, Oct. 1912. 



"Head pale yellow, vertex usually carinate, posterior angles rather 

 acute and produced backward. Posterior margin emarginate. Inter- 

 orbital space (posterior margin) about twice in the median length of the 

 head in the male; one and a half times in the female. Inner margins 

 of eyes parallel in facial aspect. 



"Pronotum lenticular, with a more or less definite median keel, rather 

 strongly margined, the margin being marked by a narrow line of brown, 

 the anterior line incised to correspond with the emargination of the head. 

 Color, yellowish, paler at the sides, with eight to ten delicate broken and 

 confluent lineations, some of the most posterior of which join the mar- 

 ginal line. Surface of pronotum polished, minutely rastrate; it requires 

 a compound microscope to resolve the rastrations. 



"Tegmina polished, nonrastrate, light yellowish with brown mark- 

 ings. The latter are quite variable, usually not displaying the familiar 

 cross-barred effect of the majority of the species in the family. Clavus 

 more or less immaculate toward the inner angle as in mercenaria Say, the 

 markings reduced to a more or less definite diagonal stripe following the 

 direction of the corial suture. The inner edge of the clavus is margined 

 with brown, and between this and the diagonal stripe mentioned are nu- 

 merous lineations, ranging from isolated flecks in some individuals to 

 interlocking and cross bars in others. Embolium immaculate, its inner 

 edge strongly margined. Corium and membrane with vermiculate and 

 inosculate brown markings, usually arranged in two rather indefinite 

 longitudinal stripes. A dark fleck on the outer edge of the membrane. 



"Metathoracic wings aborted in both sexes to a rudiment which ex- 



