1893. 



155 



rostrum and anal lobes. While examining a living ? I saw it con- 

 stantly retract the dorsal epidermis, on both sides, just behind the 

 antennae, and considerably within the margin, and then instantly 

 regain its position. The area retracted was comparatively large, and 

 it had much the appearance of an india rubber ball regaining its 

 position after pressure. 



EXPLANATION OF PLATE II. 



? — fig. 1, body under-side ; la, antennae ; 16, rostrum ; Ic, leg ; Id, last five seg- 

 ments ; le, spinneret ; If, profile of last five segments, showing extrusion 

 of egg ; Iff, pygidium ventral ; Ih, ditto, dorsal aspect ; 2 and 2a, scale, 

 profile and dorsal aspect. 



Larva — fig. 3, antennae ; 3a, leg ; 36, rostram ; 3c, anal portion of body. 

 Chester : January^ 1893. 



THE WEST INDIAN SPECIES OF MYTILASPIS AND PINNASPIS. 

 BY T. D. A. COCKEEELL, T.Z.S. 



We have in the West Indies, so far as at present known, three 



species of Mytilaspis and 

 two of Pinnaspis. Ox the 

 Mytilaspis species two are 

 , new, and the third is the 

 common mussel scale of 

 the orange, M. citricola. 

 It is singular that M. 

 Gloveri, the other orange 

 scale in the Southern U. S., 

 is not found in the West Indies. I have J7. Gloveri from Louisiana, 

 sent by Prof. Eiley, and it is fully distinct from anything we get here. 

 Pinnaspis is a genus I separated from Mytilaspis in Journ. Inst. 

 Jamaica, 1892, p. 136. Our two species are P. pandani and a new 

 one on bamboo. 



Mytilaspis citeicola (Pack.), Comst. 

 This is said to be identical with M. pinnceformis, an orchid scale. I have seen 

 no orchid Mytilaspis here, although I have been particularly interested in looking 

 for scales on orchids. Supposing citricola to = pinnaformis, it is rather remarkable 

 that it does not occur on orchids in Jamaica, since it is so very abundant on Citrus. 

 It is, however, a fact, that certain Coccidce differ in their food-plants in different 

 countries, although the specimens can be separated by no ascertainable structural 

 characters. Such is the case with Aspidiotus aurantii, Maskell, the well-known red 

 scale of Citrus trees, which in Jamaica is common on lignum vitae, and occurs on 

 Cycas and Areca, but never, so far as observed, on any Citrus. And there is here 

 no mistake about identity, as Mr. Maskell himself has examined some of the 

 Jamaican specimens. M. citricola has been sent to me by Mr. C. A. Barber from 

 Antigua, where it was Injuring tangerine orange trees. 



