>o.i362. ALEYRODIDS OF CALIFORNIA— BEMIS. 527 



ventral secretion which may form a narrow base upon Avhicli the larxa 

 rests. The hitero-maro-inal hairs and tlie maroinal rim. usually pres- 

 ent at this stage, are wanting. Cremilatitjns indistinct; segmentation 

 of abdomen distinct on central region: on each side of abdomen, about 

 midway between the lateral margins and median line, there is a row of 

 p(H-es which extend from vasiform oritice eepludad to the thoraco- 

 abdominal suture, one pore to each segment; these pores are distinct 

 in the majority of specimens. 



The dorsum bears live pairs of conspicuous long tapering spines; 

 the cephalic pair is the longest; it is about two-thirds as long as the 

 larva is wide and arises mesad of the eyespots; the metathoracic pair 

 is the shorter and more slender, the pair on first abdominal segment is 

 similar to the second pair; the fourth pair is the shortest and is laterad 

 of the cephalic margin of the vasiform oritice; the fifth pair is caudo- 

 submarginal in position, is stout, and projects caudad beyond the 

 margin. The margin bears one pair of latero-cephalic hairs and one 

 pair of latero-caudal ones; both are short and delicate; the usual pair 

 of caudo-marginal seta? are wanting. 



Vasiform oritice subcircular and bordered b}" a narrow, raised rim of 

 deeper yellow color than the remaining dorsum. Operculum relatively 

 the same shape and nearly tilling the oritice, the cephalic margin 

 straight; dorsum apparently setose. Lingula about length of orifice, 

 cylindrical at base, with enlarged distal portion, the entire organ 

 densely setose. Eye-spots single, large, of irregular shape, and ])right 

 red in color. Legs functional; antennae not seen. 



The older larval stages differ from the foregoing only in greater 

 size and in the color lieing a brighter yellow. The second and third 

 pairs of dorsal spines equal the cephalic pair in length, the fourth 

 pair itre approximately longer. The marginal crenulations and wax 

 tul)es are more evident. The legs are reduced, only the large, upper 

 part being present. In a larva whose size was ().() nun. by 0.4 mm. 

 minute antennte were seen. 



Piijxi-ea.se. — Size, 0.t> b}- 0.56 mm.; shape, elliptical; color, with 

 inclosed pupa, a In-ight yellow; when empty, translucent white; tex- 

 ture, film-like. The vertical, ventral secretion of wax is sometimes 

 flattened out and assumes the appearance of a lateral fringe. General 

 characters as in later larval forms; the dorsum bears three longitudinal 

 parallel rows of pores, one on median line and the remaining two rows 

 about midway between the median row and the lateral margins. Mar- 

 ginal cremilations broad and rounded; the reentrant angles acute; the 

 lateral wax tubes distinct and bent downward. Cephalad of the vasi- 

 form orifice there are two crescent-shaped thickenings in dorsum. 



The distal portion of the lingula is conspicuously rounded and setose, 

 and the apex is divided into two minute pointed lobes, laterad of 

 which are two blunt tubes. In living specimens the lingula is frequently 

 proti'uded and dorsally i"(>tracted. 



