500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



the wax plate is divided transversely along the thoraco-abdorainal 

 suture. 



The dorsum is covered with minute pores, underlying which are 

 relatively large, irregular, intersecting canals/' It has a wide, conspic- 

 uous, irregularly striate, marginal rim, which bears a row of minute, 

 tubercled hairs. The crenulations of this rim are sharply pointed, inci- 

 sions shallow and reentrant angles acute; mesad of the rim are three 

 or four rather regular rows of small pores. The abdomen is rounded 

 into a slight keel on the dorsi-meson, along which the sutures are 

 distinct and the outlines of the legs are conspicuous. Vasif orm orifice 

 subcircular; its margin is a dark raised rim or fold which bounds the 

 orifice on its lateral sides, but does not quite come together cephalad; 

 on each inner, lateral edge of its cephalic margin, there is a short hair 

 which projects into the open space within the orifice; the lining is laid in 

 conspicuous, transverse folds. Operculum almost obsolete, sul)rectan- 

 gular; cephalic margin, straight. Lingula very short, projecting 

 slightly beyond the operculum; it is cylindrical at base and widened at 

 the apex, which is densely setose. There is a pair of short spines latero- 

 cephalad of the vasiform orifice; the latero-caudal hairs are present, 

 so delicate that they are nearly invisible, but the usual caudal hairs 

 are absent. 



Adults. — Unknown. 



Cotypes.^^o. 7088, U.S.N.M. 



Collected on the under sides of the leaves of the Quercus agrlfolla 

 and Prunus ilicifolia in the Santa Clara County, and on the slopes of 

 the Sierra Morena Range. On the former food plant only an occa- 

 sional pupa-case has been found, but the leaves of the cherry are fre- 

 quently^ incrusted with the immature forms. Verified adults have 

 never been secured, although many pupa-cases were isolated. 



15. ALEYRODES FLOCCOSUS (Maskell). 

 Aleyrodes Jioccosa jMa.skell, Trans. N. Z., Inst., 1895, p. 432. 

 From Jamaica, on Lignimi-vitx., in company with A. stellata. 



16. ALEYRODES ERRANS, new species. 

 Plate XXX, figs. 20-21. 



Eg<j. — Size, about 0.21 by 0.11 mm.; yellow, curved, shell umnarked. 

 Pedicel short, slender, and on the convex curve at one side of truncate 

 base. 



Larva. — (Stage 1.) Size 0.3 by 0,16 mm.; subelliptical, pale, semi- 

 transparent 3"ellow. Dorsum convex and bearing five pairs of spines — 

 a pair of very long curved ones on the cephalic region; two pairs nmch 

 shorter on the thorax; a pair on abdomen cephalad of the vasiform ori- 



«These may be spaces which, in the living insect, are filled with wax; when freshly 

 mounted specimens are examined the spaces are seen filled with air, 



