32 



BULLETIN 100, U. S. DEPARTMENT OF AGRICULTURE. 



merits: Length of body (average), 1.67 mm.; width of body (average), 0.61 mm,; 

 wing expanse (average), 4.02 mm.; antenna, joint I, 0.053 mm.; joint II, 0.046 mm.; 

 joint III, 0.41 mm.; joint IV, 0.335 mm.; joint V, 0.32 mm.; joint VI, 0.191 mm.; 

 filament, 0.123 mm.; cauda, 0.084 mm.; Cornicles, 0.009 mm. 



Described from numerous specimens, Walnut Creek, CaL, October, 

 1912. 



The Oviparous Forms. 



the oviparous female (fig. 16). 



Wingless. General color pale lemon-yellow, in mature individuals the central part 

 of the abdomen diffused with orange. Body elliptical, "widest at the third abdominal 

 segment. Antennae half as long as the body, not on frontal tubercles, pale, with 



Fig. 16. — Monellia caryella: Oviparous female. (Original.) 



an apical black ring on joints III to VI, inclusive; joints I, II, and filament dusky; 

 joint ILT longest; joints IV and V subequal and each about four-fifths as long as joint 

 III; filament a little shorter than VI; VI about four-fifths as long as V. Eyes crimson. 

 Legs pale yellow; tarsi dusky. Hind tibiae slightly thickened. Cornicles very 

 small, pale. Cauda pale, globular, beset with a fringe of weak hairs, not as long as 

 the hind tarsi. Thorax and abdomen with six longitudinal rows of capitate bristles, 

 each surmounting a pale tubercle. Penultimate segment of the abdomen encircled 

 near its posterior margin with a fringe of weak hairs. Eight capitate spines on the 



