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University of California Publications [Entomology 



F, G) arise from small, but distinct frontal tubercles (fig. 9, B), 

 are black throughout with few knobbed hairs. The length is 

 greater than that of the body, the respective articles measuring: 

 I 0.07 mm., II 0.06 mm.. Ill 0.52 mm., IV 0.4 mm., V 0.36 mm., 

 VI 0.8 mm. (base 0.12 mm., filament 0.68 mm.), total 2.21 mm. 

 The sensoria are circular, of various sizes and numerous on 

 articles III, IV and V, with the usual ones in the process of VI. 

 The number varies considerably on the different articles, as the 

 following tabulation will show : 



The rostrum is pale with the apical half dusky and reaches 

 slightly beyond the third coxae. The thorax is black with reddish 

 areas at the sides and between the segments. The wings are 

 normal in length with brownish veins and stigma. The venation 

 is shown in the accompanying drawing (fig. 9, ^). The legs are 

 nearly all black, excepting the middle of the tibiae and the 

 bases of the femora. As in the apterous form the tarsi (fig. 9, 

 E) are exceptionally small. The a])domen is reddish with small 

 irregular dark markings on the sides and dorsum. The cornicles 

 (fig. 9, C) vary from pale dusky to black, slightly imbricated, 

 cylindrical with a slightly flaring mouth. The length is 0.32 mm., 

 or about three times the length of the hind tarsi. The cauda 

 (fig. 9, D) is yellow or reddish and about two-thirds the length 

 of the cornicles. 



