72 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



Claremont, California, Mountains (Crawford), on a species of Spruce, 

 June, 1911, found in myriads infesting tlie twigs and needles; El 

 Centro, California (J. C. Bridwell), on alfalfa; San Luis Obispo, Cali- 

 fornia (Condit), on "green-house tomatoes," September, 1909; Argus 

 Mountains, on Pinus monopJiylla, and Death Valley, California (Koe- 

 bele). May; Alameda, California (Koebele), September. 



Food plants: Pepper (Capsicum annuum), tomato (Solanum nigrum), 

 potato (Solanum tuberosum), Pursliia sp., arbor- vitas (Thuja occideiv- 

 talis), spruce (Picea sp.), pine (Pinus rnonophylla) , alfalfa (Medicago 

 sativa). Some of these plants may not be true food plants. This 

 is a species easily distinguished from all others by the striking colora- 

 tion of the body. Its distribution seems to be general throughout 

 the southwestern United States and is often found in great numbers, 

 sometunes becoming a pest to cultivated plants. Since describing 

 P. ocellata (Crawford '11a: 447) as a new species closely related to 

 cockerelli, I have had an opportunity to examine many more speci- 

 mens from many localities, and have come to the conclusion that all 

 these represent but one species more or less variable in some respects. 

 The variation in degree of coloration is so marked and continuous 

 that it seems useless to try to distinguish the varietal forms nigra 

 and fiava. 



PARATRIOZA ARBOLENSIS Crawford. 



Figs. 197, 200, 207, 345, 301, 532. 



Paratrioza arbolensis Crawford '10a: 229. 



Allotrioza arbolensis CRAWFonn '11a: 444. — ^Patch '12:231. 



Length of body 2.6 mm; length of forewing 3.9; width of head 

 0.96. General color light green throughout. Body very large. 



Head a little deflexed, very large, punctate; vertex arcuate on 

 posterior margin, front margin sharply defined, with a deep fovea on 

 each side of median line discally and a marked depression diverging 

 toward insertion of antennas with a prominent elevation on each side 

 of median line between depressions. Eyes very large. Genal cones 

 short, horizontal. Extending outward, subacute at apex, moderately 

 pubescent. Antennae large basally. Clypeus very large, easily 

 visible from in front. 



Thorax large and broad, slightly broader than liead including eyes, 

 more coarsely punctate than vertex. Pronotum rather long, some- 

 what depressed below head and praescutum; latter long and broad, 

 rather triangular, narrow cephalad. Legs large; hind tibiae with 

 large spines at apex and a distinct spur at base; claws large. Wings 

 hyaline, large, straight on hind margin, front margin arched, not 

 quite three times as long as broad. 



Genitalia. — Male. — Forceps rather large at base, subacute at apex; 

 anal valve small, simple. Female. — Genital segment rather small, 



