312 University of California Publications [Entomology 



dusky with the greater portion of article III and the bases of 

 articles IV and V pale. The length is nearly as great as that 

 of the body, the measurements of the respective articles being : 

 I 0.08 mm., II 0.07 mm., Ill 0.41 mm., IV 0.3 mm., V 0.26 mm., 

 VI 0.16 mm. (base 0.13 mm., spur 0.03 mm.), total 1.28 mm. 

 There is considerable variation in the measurements of different 

 individuals, but the relative lengths are fairly constant. The 

 usual sensoria are present on articles V and VI, but very few 

 hairs are present on any of the articles. The rostrum is light 

 amber in color and reaches slightly beyond the third coxae. The 

 legs are rather short and dark brown with lighter areas in the 

 middle of the tibiae of most specimens. The cornicles (fig. 6. C) 

 are dark, very short, wide at the liase and narrow at the mouth, 

 which has a very wide lip or flange and small opening. The 

 Cauda (fig. 6, i>) is dark, broad at the base with a rounded tip 

 and normally hairy. The anal plate (fig. 6, B) is dark, rounded 

 and has a small but distinct incision or notch in the middle. 

 The nymphs are slightly paler in color than the mature forms. 



WINGED VIVIPAROUS FEMALE— VIRGOGENIA 



The winged forms are dark reddish brown with black mark- 

 ings. The length averages 1.9 mm., and the greatest width 1 mm. 

 The head is light or very dark reddish brown. The antennae 

 (fig. 7, C) are dusky or black with the greater portion of article 

 III and the basal halves of IV and V pale yellow or amber. They 

 are about three-fourths the length of the body, the measurements 

 of the respective articles being: I 0.1 mm., II 0.07 mm., Ill 0.44 

 mm., IV 0.3 mm., V 0.28 mm., VI 0.18 mm. (base 0.13 mm., 

 spur 0.05 mm.), total 1.37 mm. There are from four to eight 

 large and small circular sensoria on article III. Of fourteen 

 antennae examined to ascertain the number of sensoria on article 

 III it was found that but one had 4 sensoria, three had 5, six 

 had 6, two had 7. and two had 8. Articles V and VI have the 

 usual sensoria. The rostrum is amber in color and reaches to the 

 third coxae. The thorax is reddish brown with very dark brown 

 or black muscle lobes. The wings are subhyaline with distinct 

 du.sky bordered veins. The venation is shown in the accompany- 

 ing drawing (fig. 1, A). The legs are dark with lighter areas in 

 the middle of the tibiae. The abdomen is reddish brown with one 

 or two rows of dark or black markings near the margins from 



