THE JUMPING PLANT-LICE OK PSYLLID^ OF THE NEW WORLD. Ill 



with numerous small impunctations over entire surface, each spot cov- 

 ering from three to five impunctations; with a band nearly free of 

 spots extending from near tip of Rs obliquely to tip of Cug; about two 

 and a half times as long as broad; first marginal cell smaller than sec- 

 ond; veins with a double row of setee. 



Genitalia. — i/aZe.^Genital segment rather elongate; forceps not 

 long, simple, slightly tapering to tip; anal valve long, similar in shape 

 to P. venusta, arcuately bulging on hind margin and emarginate sub- 

 apically. Female. — Genital segment about as long as rest of abdo- 

 men, similar in shape to that of venusta. 



Described from many males and females from Ames, Iowa (C. W. 

 Mally); Kansas (no data); Colorado (no data); several points in 

 Texas: Piano (E. S. Tucker), October, November; Wills Point (F. C. 

 Bishopp), March 15, 1904; Dallas, November to March; Ithaca, New 

 York, 1893. 



In the Fifth Report of the U. S. Entomological Commission (1890), 

 pages 614-622, Riley describes the galls of several species of this genus. 

 The adult insects of some of these species he has described in another 

 paper, but for several closely related to c.-Tnamma he has described 

 nothing but the gall. No authentic specimens of his species c.-aster- 

 iscus, c. -umbilicus, c.-puhescens, c.-glohulus, c.-cucurhita and c- 

 cucurhita var ?, are available, and therefore, with no description of the 

 insect extant, nothing can be done at present, except to disregard 

 these species until some knowledge of them is obtained. In all 

 probability, all of these species are only variations of the species 

 c.-mamma, since the insects are said to be very similar and the differ- 

 ences in the galls are not great. In the collections at hand there are 

 large numbers of specimens belonging to and closely related to this 

 species, forming a large series more or less contmuous in variation. 

 In all this series there are almost no structural differences at all, the 

 only variations being in size of body and maculation of wmgs. The 

 size of the body varies almost continuously from somewhat larger 

 than the size given for c.-Tnamma to almost as small as c.-vesiculum. 

 The spotting of the forewing varies in intensity within certain limits, 

 but always the oblique, white band is present apically; the margins 

 of this band are often darker than the rest of the wmg surface, and 

 sometimes a very dark band about as broad as the light band borders 

 the latter on the inside. Although there exist in the series at hand 

 several interruptions in continuous variation it is quite probable that 

 more extensive collections will fill these gaps and demonstrate that 

 this is a very widely variable species, instead of many species as stated 

 by Riley. 



In a large collection of galls one notices many variations in form 

 and size. It is this fact that has given rise to many of the species 

 listed above. After much careful study Mally ('93:136) has stated 



