A NEW SUBSPECIES OF CEROPLASTES FROM 
MEXICO. 
BY T. D. A. COCKERELL. 
In Zoe, Vol. iii, Oct. 1892, Prof. C. H. Tyler Townsend 
describes, without naming, a Ceroplastes found by Dr. A. Dugésat ° 
Guanajuato, Mexico, on Bignonia and Chrysanthemum. Prof. 
Townsend has now kindly sent me two examples of this Cero- 
plastes, with the suggestion that if new, the species might be 
called C. cistudiformis. I have adopted this name, while 
regarding the insect as hardly a distinct species, but rather a 
subspecies of C. ps¢diz, Chavannes, 1848. 
CEROPLASTES PSIDII CISTUDIFORMIS, subsp. nov. 
Scale: (largest specimen) length 74 mm., breadth 6 mm., 
alt. 44% mm. Color pale grey, with a slightly pink tinge at 
sides. Each cereous plate with numerous radiating fine blackish 
lines, and the lateral plates with two not very well-defined 
concentric lines. Below the nucleus of each lateral and terminal 
plate, the margin is broadly yellowish-white, without marks; 
these broadly triangular yellowish-white portions are separated 
above from the rest of the scale by black bands, which become 
evanescent towards the nuclei of the plates. The central plate 
has stronger radiating lines or bands at intervals, giving it the 
superficial appearance of being divided into eared as is the 
case in C. janeirensis and psidii. 
The plate-nuclei are small, blackish, with the usual white 
secretion in the centre. That of the dorsal or central plate is 
rather large. Inside of the (cereous) scale pale ochreous, the 
divisions between the plates marked with purplish-brown. 
Dorsal plate approximately circular, its posterior half strongly 
gibbous in both the specimens, 
Anterior end with a single plate resembling the adjacent 
lateral. Each side with two approximately square lateral plates. 
Posterior end with a very large broad compound plate, with 
two distinct nuclei, and an obscure third one between them. 
One of the specimens contained the desiccated body of the 2. 
The skin (corresponding to the ‘‘ scale” of a Lecanium) is yellow 
