498 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



there are two transverse lines, each containing- six pores, and latero- 

 cephalad of these are two pairs; on the abdomen, each side of the dor- 

 sal keel, are two longitudinal I'ows of pores, the inner row of six and 

 the outer with five; on the second abdominal segment there is an 

 additional pore on each side, thus making a transverse row of six 

 pores instead of the usual number. 



Adult female.- — (Bred from pupa-case.) Length of body, 1.1 nun.; 

 fore wing, 1.05 bv 0.()5 mm. ; hind tibia, 0.1 mm. ; hind tarsus, 0.2 nun. 

 Abdomen whitish yellow, head and thorax darker, legs and anteinise 

 white; wings immaculate, main veins to apex; in the fore wing the 

 flexure is very slight and the veinlet arises near the base of the wing; 

 between the veinlet and the anal margin there is a conspicuous, oblique 

 fold; in the hind wing the vein is straight. Antennae, length formula, 

 3-7-5-6-1; segment one, short, about as long as broad, cup-shaped; 

 segment two, pyriform, densely setose and with a number of short 

 spines set in tubercled bases. Genitalia usual. 



Alryrodes coronatus has been found in varying numljers upon every 

 live oak examined and is widely distriliuted in California, specimens 

 having been received from San Diego to Mendocino counties. It seems 

 to be more liable to the attack of fungus than an}" other species wdiich 

 has been under observation; material from widely separated localities 

 and from difl'erent hosts, suffering equalh^ Frequently the leaves 

 are so thickly covered with the immature forms that a solid crust is 

 made upon the underside; such leaves are abnormally small, paler in 

 color, and curled; sometimes only individual leaves on a tree are in 

 this condition, and again all are infested, and the tree is stunted. 



Collected on the live oak {Qucrcus CKjrifolia) by Mr. Edward M. 

 Ehrhorn at San Jacinto and the Santa Catalina Islands, southern Califor- 

 nia; b}'^ Mr. James McMurph}" at Albion Ridge, Mendocino County; 

 and by the author in San Ramon Valle}", Santa Clara Valley, Golden 

 Gate Park, and in Alameda County in various places. Also collected by 

 Mr. G. H. Coleman on the tan-bark oak {Qnerciis densiJJora)., at the 

 head of the Big River Can3"on, Mendocino County, June 6, 1901; and 

 b}^ the author on the same host, plant, from the slopes and ridges of 

 the Santa Cruz and Sierra Morena Ranges. This same species has also 

 been found on Ileteromeles arhutlfolia and xirhutus menziexil on Kings 

 Mountain, and in the Santa Clara Valley. The madrones along the 

 roads leading from the San Ramon Valley to Haywards, Contra Costa 

 County, were carefully examined in 1901, but this species was not 

 found upon them; also collected by the author on the leaves of Querciis 

 chrysolepls in the Yosemite Valley, in July. 1902. 



12. ALEYRODES ERIGERONTIS Maskell, 



Aleyrodes erigeronti>< Maskell, Trans. N. Z. Inst., 1895, p. 429; Entom. News, 

 VII, p. 247. 



On an Ji'rfgeron, Escalon, Mexico, 



