110 Journal New York Entomological Society. [Vol. vi. 



On "nettle tree," Cuantla, Morelos, May 31, 1897 (Koebele). 

 Div. Ent., No. 7878. The nettle tree, as stated elsewhere in this paper, 

 is probably Manihot sp. [C. H. T. T.] 



Cerococcus corticis, sp. nov. 



Adult 9 . Elongate-globular, balloon-shaped, apodous and without antennas, 

 integument whitish and transparent after boiling ; anal cone chitinous, yellowish at 

 base, brownish on terminal margins, wide and stout, conico-cylinclric, about as long as- 

 basal width, less in diameter at discal end than at base, the margin deeply notched 

 on ventral and dorsal aspect, the notch reaching to about middle of length of cone, 

 the margins with a row of strong bristly hairs curved at ends, the lateral lips exter- 

 nally rather thickly clothed with the same extending^down about ^ way to base of 

 cone. Between bases of lateral lips of cone inside appears what is evidently a 

 median tubercle though not distinct, corresponding to the median tubercle situated 

 between the two elongate caudal tubercles of C. quercus Comst. Anal ring con- 

 cealed, but the stout, long cylindriform hairs arising from it are conspicuous, six in 

 number (3 pairs), and reach well beyond ends of lateral lips of cone. In a younger 

 specimen these hairs reach fully as far beyond ends of lips as depth of notch of anal 

 cone. In a still younger specimen they are not apparent at all. The clear light yellow 

 surface of basal part of cone shows a pair of brownish spots on either side, the inner 

 pair much the larger. Spiracles distinct. Mouth parts large and well-developed ; 



9 full of large well-developed ova. Length of 9 on slide, nearly 2 mm. ; width, 



if mm. 



9 Scale white, irregularly oval in form, seed-shaped or bead-shaped, covered 

 wholly with a waxy secretion which has a felted, sometimes cottony, appearance on 

 the surface. Length, 2 to 2^ mm. ; width, about if mm.; thickness, about I to il 

 mm. Apparently stuck into the surface of the rough bark. 



On bark of Quercus engelmanni, Nogales, Sonora, April, 1897 

 (Koebele). Div. Ent., No. 7880. Professor Cockerell had determined 

 this species rather hastily as C. ehrhorni, and Mr. Pergande called at- 

 tention to the fact that it was very different in appearance and must be 

 distinct. As will be seen, the anal characters show the species to be 

 very distinct from ehrhorni. It will be well also to note the very 

 marked difference between corticis and quercus in the anal characters,, 

 as shown in Comstock's figure of the latter. 



Phenacoccus gossypii, sp. nov. 



Sac pure lime white; length, 5 to 6^ mm.; width, 2 to 2^ mm.; parallel-sided,, 

 more widened, larger and stouter than in helianthi, and the body of 9 n °t apparent 

 at one end, the sac wholly covering the body. Boiling in caustic soda does not stain 

 the liquid. 



Adult 9 • Length of body, 3 mm. Approximate antennal formula 2 ( 39) 

 (145678). The antennae and legs are practically the same as in helianthi. The 

 digitules of the claw are distinct, rather slender, well knobbed, and extending beyond 

 the end of the claw about % the length of the latter. Antennae and legs pale 

 brown. 



