Pomona College Journal of Entomology 



553 



Pemphigus fraxini-dipetalae n. sp. 

 (Figure 185) 

 CALIFORNIA MOUNTAIN ASH LOUSE 

 WINGED VIVIPAROUS FEMALE (Figure 186 A) 



Length of body 3-50 mm., widtli of mesothorax 1.15 mm., greatest width of 

 abdomen l.T/J mm., wing exjiansion 1:2.00 mm., very large species. 



Prevailing color — Black, abdomen covered with long bluish-white flocculence, 

 wliich extends posteriorly. Head — Black, mucli wider tlian long, narrower than 

 prothorax. Eyes — Dark red or brown, nearly black. Antennae — (Figure ISfci D). 

 Six-articled, reaching just beyond metathorax, brownish-black in color, very few 

 hairs, length of articles: I, 0.1 mm.; II, 0.14 mm.; Ill, 0.63 mm.; IV, 0.32 mm.; 

 V, 0.35 mm.; VI, 0.37 mm., (unguis 0.08 mm.); total 1.91 mm.; sensoria large. 



Figure 185. Pemphigns fraxini-dipetalae 



Oil twigs of Fraxinus dipetala. Note the winged viviparous female and fioccu- 

 lently covered nymphs. 



transverse, twelve on article III, tliree on IV, usual number on V and VI. 

 Rostrum — Reaches just to metathorax, light yellowish with dark base and tip. 

 Prothorax — Very dark brown or black, three times as wide as long. Mesothorax — 

 Very black, muscle lobes weD developed and shiny. Metathorax — Black, short. 

 Abdomen — Of living specimens very dark green or black, (in mounted specimens 

 it may appear brown, orange or yellowish due to bleaching), covered with long 

 bluish-white flocculence which is tliickest posteriorly and decreases towards the 

 base, where there is scarcely any, wax glands not distinct, row of small dark 



