450 Mr. T. D. A. Cockorell on Coccidx. 



LXXIII. — A Contribution to the Knowledge of the Coccidae. 

 By T. D. A. COCKERELL. 



Aspidiotus {Biaspidiotus) Fernaldi hesperius^ subsp. n. 



5 . — Scale scarcely over 1 niillim. diain., circular, mode- 

 rately convex, blackish, with a rough, powdery, whitish in- 

 crustation ; exuviffi central or subcentral, orange. Young 

 scales show a white dot and ring. 

 (^ . — Scale elongated. 



$. — Circular, no constriction between head and thorax; 

 dull orange, appearing by transmitted light ))ale, with brown 

 marbling, the caudal end orange. Two pairs of lobes, the 

 median lobes like those of Fernaldi; second lobes much 

 narrower than in Fernaldi and often notched; third lobes 

 altogether absent. Two pairs of interlobular incisions, with 

 chitinous processes or glands ; in the first incision the inner 

 process is very much the largest, fusiform, not curved. 

 Spines large, but those at the outer base of the median lobes 

 are short and blunt. Squames (only seen in unboiled speci- 

 mens) very small, mostly truncate, not in the least fimbriate ; 

 a pointed squame in the second interlobular interval ; short 

 truncate squames at intervals along the margin beyond the 

 second interlobular interval. Anal orifice to tips of median 

 lobes 30-33 /a; genital orifice to tips of median lobes 96- 

 lli /x. Dorsal glands smaller than in Fernaldi, the fourth 

 row absent ; first row of about 3 glands, second of about 11, 

 third of about 13. 



Circumgenital glands : posterior laterals none to 5, usually 

 3 ; anterior laterals 3 to 7, usually 4 or 5 ; median none to 3, 

 usually 1 or 2. 



Jlab. Prescott, Arizona, ]\Iarcli 1902, densely crowded on 

 the bark of a very large shrub with grey bark and small oval 

 leaves, which are very hairy on the midrib beneath. The 

 scales are so exactly the colour of the bark as to be almost 

 invisible. 



This insect will doubtless be considered a valid species 

 hereafter, but it is very close to A. Fernaldi, and may stand 

 as a subspecies of it until we know more about the variation 

 of both. It is also close to A. ostreceforniis, but is readily 

 distinguished from that by the fewer circumgenital glands, 

 the inner chitinous process of first interlobular interval much 

 larger than the outer, and the anal orifice nearer to the 

 liind end. 



