IDENTIFICATION OF ROCKY MOUNTAIN COCCID^ 201 



Note. — The male scale of D. echinocacti cacti is unicarinated; that of boisduvalii is 

 tricarinated. In Texas are found D. celtidis, Ckll. (on Celtis) and D. texensis (Ckll.) 

 (on Sophora). In Arizona are found D. arizonica, Ckll. (on Prosopis) and D. toumeyi, 

 Ckll. (on Holacantha). 



CHRYSOMPHALUS, ashmead 



Native species, found on oak ....... lilacinus (ckll.) 



Tropical species, found only in hothouses ........ i 



i. Scale black or almost, with a light spot marking the exuviae . aonidum (linne) 



Scale reddish, not dark ...... dictyospermi (morgan) 



TARGIONIA, signoret 



On Yucca and Isocoma in the Mesilla Valley, N. M.; scale comparatively large; 

 caudal lobes of female truncate; caudal area with very numerous small glands 



yuccarum (ckll) 1 



On Yucca data in the Mesilla Valley, N. M.; smaller than the last; female with only 

 one pair of well-defined lobes, these rounded at the end, and notched on each 

 side; spines much larger than in the last . yucca: neomexicana (ckll. & parrott) 



On Gutierrezia glomerella in the Mesilla Valley, N. M.; female scale i\ to i j mm. 

 diameter, snow white; exuviae marginal, covered by a delicate film, often rubbed 

 off, exposing the shining straw-yellow first skin gulierrezice (ckll. & parrott) 



On leaves of grass at Las Vegas, N. M.; female scale about i mm. diameter, white, 

 with pale yellow exuviae, which are covered, and surmounted by a white boss; 

 female differing from gutierrezia in the rounded, wide-apart median lobes, 

 the much larger blunt second and third lobes, and the dorsal glands, which are 

 few and in rows, instead of being numerous and scattered . graminella (ckll.) 



ASPIDIOTUS, bouche 



Female with neither elongated thickenings of the body wall nor incisions with thick- 

 ened edges at the bases of the caudal lobes . . . A spidiotus, s. str. 

 Female with incisions at the bases of the lobes, flanked or margined by chitinous pro- 

 cesses, which, however, are never greatly elongated ..... i 

 i. Scale quite convex, with the exuviae marked by a darker spot; anal orifice large; 



median lobes large, the others hardly or not developed . Hemiberlesia , ckll 



Scale flatter, usually (but not always) dark, the exuviae appearing as a yellowish 

 or reddish spot ; anal orifice smaller; second pair of lobes usually distinct . 



Diaspidiotus, berlese and leonardi 



ASPIDIOTUS, s. str. (Evaspidiotus, Leonardi) 

 Female scale white or whitish; exuviae exposed, yellow; female with four groups of 

 circumgenital glands; on indoor and hothouse plants, such as oleander, ivy, etc. 



hedera (vallot) 



' Besides the Hymenoxys, there exists a second rubber-plant in the Rocky Mountains. We have obtained 

 a piece without data, and the only clue to its origin is the occurrence upon it of some specimens of Targionia 

 yuccarum/ 



