THE COCCIDAE OF SOUTHWESTERN UNITED STATES 17 



Habit. Occurring in galls on the under side of the leaf, the gall 

 opening on the upper side of the leaf by an elongate slit parallel to the 

 midrib of the leaf. Usually there is but a single gall on each leaf, but 

 there may at times be two. The galls are quite large, 10 to 15 mm. high, 

 8 to 10 mm. in greatest thickness at the base, compressed conical in form, 

 tapering to a sharp point. After drying they are hard and woody. The 

 insect quite fills the cavity of the gall and lies with its dorsum against the 

 opening. The shape of the insect is conical, the heavily chitinized dor- 

 sum being flat, the membranous venter conforming to the shape of the 

 cavity. 



Morphological characteristics. Fully mature female with the derm 

 of the dorsum heavily chitinized, that of the venter remaining membran- 

 ous. Dorsum flat, circular in outline, anal opening at some distance 

 from the margin. Before maturity is reached the derm is membranous 

 throughout and it is while in this condition that the insect may best be 

 studied. The derm of the dorsum is thickly beset with 8-shaped 

 pores (Fig. 4E), mingled with a few more or less pentagonal pores 

 (Fig. 4F) and a few small, basally swollen spines (Fig. 4C) which are 

 most numerous about the margin, and with numerous slender setae just 

 behind the anal opening. A few extremely minute tubular ducts 

 (Fig. 4D) are present. Venter likewise with 8-shaped pores and also with 

 numerous multilocular pores (Fig. 4G). Anal lobes entirely lacking. 

 Anal opening at the inner end of a short invagination. In mature indi- 

 viduals the external opening of this invagination (Fig. 4A) is somewhat 

 parabolic in outline. Antennae (Fig. 4j) five to six-segmented, short 

 and stout. Legs (Fig 4H) well developed, claw not toothed beneath, 

 digitules of the claw, filiform, not knobbed at the tip. 



First stage larva (Fig. 4K) with well -developed anal lobes 

 (Fig. 4B) ; anal ring on the ventral side, bearing six small setae; margin 

 with a single row of short, stout, truncate spines, dorsum with two lon- 

 gitudinal rows of such spines; antennae (Fig. 41) six-segmented, of the 

 usual Eriococcine type. 



Genus ERIOCOCCUS Targ. 



A considerable quantity of material belonging to this genus is at 

 hand, but most of the species cannot be identified and are left for some 

 future time. Only those species are here recorded of which the identifi- 

 cation is practically certain. Mr. Harold Morrison of the United States 

 Bureau of Entomology and the present author have prepared a paper 

 dealing with the North American species of this genus which it is hoped 

 may some day be published, and the redescription of the species here 

 recorded is left for that paper. 



