130 THE CANADIAN ENTOMOLOGIST. 



and inconspicuous, much shorter than in D. Totviisendi. Legs and 

 antennse pale yellowish. 



Middle leg measuring about as follows in \i : Coxa, iii : femur with 

 trochanter, 231 ; tibia, 180; tarsus, 90; claw, 30; width of femur, 57. 

 Antennae 8-jointed, the joints measuring in /x : (i.) 45-51, (2.) 36-40, (3.) 

 33-42, (4-) 18-27, (5-) 25-27, (6.) 16-24, (7-) 27, (8.) 69-78. Formula 

 varying from 8132(47)56 to 8123(57)46. 



Hab. — Tempe, Arizona: Numerous on the butte, on Zarr*?^ trident at a, 

 Oct. 28, 1899. (Ckll.) This interesting species is named after Mr. 

 Fred. M. Irish, of the Arizona Normal School, who was with me at the 

 time of its discovery. D. Irishi is closely related to D. Steeli, which in- 

 fests the same plant in New Mexico, but it is readily distinguished by its 

 much more convex ovisac, and its habit of clustering on the twigs at the 

 nodes, instead of living on the leaves. In the latter respect the insect 

 resembles D. prosopidis. In the most advanced state the $ is very 

 nearly, but not entirely, covered by the ovisac. 



Aspidiotus ( Hemiberlesia) candiduhis, sp. n. 



$ . — Differs thus from A. latanice : Anal orifice smaller, about as 

 big as one of the median lobes ; width of anal orifice about 12 /x ; median 

 lobes not or barely notched ; nine squames, close together and little 

 branched, on each side of the median lobes ; inner chitinous processes of 

 interlobular intervals conspicuously larger than the outer ; spines (hairs) 

 long, even exceeding the squames ; four groups of circumgenital glands, 

 posterior laterals 4 to 5, anterior laterals 4 \ margin of insect with very 

 long bristles at distant intervals ; embryos in 5 very large, about 210 /x 

 long ; median lobes of embryo twice notched on outer side. 



9 . — Scale white with a yellowish tinge, only slightly convex, exuviae 

 sublateral, varying from pale straw-colour to ferruginous brown. $ scale 

 elongate-oval, white, with the pale straw-coloured exposed exuvia near one 

 end. 



Hab. — Tucson, Arizona, just behind the University ; locally abun- 

 dant on leaves and twigs of Frosopis velutina, along with plenty of Xero- 

 philaspis prosopidis. Collected in November, 1899, by the writer, in 

 company with Prof Toumey. The $ scales are much more abundant 

 than the 9 ; when originally describing X. prosopidis (Suppt. to Psyche, 

 Dec, 1895) I had some of these $ scales, and regarded them as belong- 

 ing to the Xerophilaspis. 



