304 University of California Puhlications [Entomology 



F, G) are yellow and black and often covered with a white fluffy 

 material giving a bluish cast to the black beneath. Articles I, 

 II and VI are dusky, while all of III excepting the middle is 

 black and IV and V are black at the extreme bases and the 

 apices. The length of the antennae is more than twice that of 

 the body; that of the respective articles being: I 0.1 mm., II 

 0.08 mm.. Ill 0.98 mm., IV 0.65 mm., V 0.58 mm., VI 0.64 mm. 

 (base 0.29 mm., filament 0.35 mm.), total 3.03 mm. The sensoria 

 are transversely oval and variable in size, but the majority are 

 about equal in length to half the width of the article. On 

 Article III there are from four to nine confined to the basal third. 

 The following tabulation will give an idea of the number on the 

 pairs of antennae of forty-four individuals, the colon separating 

 the individuals and the comma the articles, 7. 7 : 6. 5 : 5, 5 : 6. 6 : 7, 

 9 : 7, 7 : 6, 6 : 5, 5 : 5, 5 : 5, 5 : 7, 8 : 8, 8 : 7, 8 : 7, 8 : 6, 6 : 7, 9 : 7, 7 : 6, 

 8 : 6, 7 : 6, 7 : 4, 5 : 6, 6 : 6, 5 : 5, 7 : 6, 7 : 5. 5 : 6. 7 : 4, 7 : 4, 5 : 6, 7 : 5, 

 7 : 4, 6 : 5, 5 : 5, 5 : 5. 6 : 5, 6 : 6, 7 : 5, 6 : 6, 7 : 6, 6 : 6, 6 : 6, 7 : 5, 6 : 6, 

 7. The usual number occur on articles V and VI. There are but 

 few very inconspicuous hairs on the antennae. A very large 

 protuberance is located on the underside of the head just in front 

 of the rostrum (fig. 1, B) w^hich it equals in length. The rostrum 

 is very short, reaching only to the front coxae. The thorax is 

 yellow with amber or slightly dusky muscle lobes and a dark 

 vitta on each side in front of the bases of the wings and two 

 indistinct dusky lines on the dorsum. The venation of the wings 

 is shown in the accompanying drawing (fig. 1. .4). The legs 

 are yellow with the apical portions of the tarsi dusky. The 

 abdomen has two longitudinal rows of dorsal tubercles (fig. 1, 

 A, E,) ; there being eight separate pairs and one large patch 

 made by the fusing of the ninth pair. A small hair or spire 

 arises from each of the dark areas and two from the largest 

 posterior one. The cornicles (fig. 1, C) are yellow, short and 

 much wider at the base than at the mouth. A very long hair 

 arises from a tubercle near the middle of the hind margin. The 

 length is 0.1 mm. The cauda (fig. 1, D) is knobbed and con- 

 spicuously dusky or black. The anal plate (fig. 1, D) is dis- 

 tinctly bilobed and pale or dusky yellow. 



The nymphs are pale yellow or very bright amber in color 

 and covered with numerous long knobbed spines or hairs. 



