284 THE CANADIAN ENTOMOLOGIST 



FURTHER NOTES ON SCALE INSECTS (COCCID^). 



BY T. D. A. COCKERELL, LAS CRUCES, NEW MEXICO. 



The numbering is continued from page 193. 



(13.) Tachardia cornuia, n. ?,T^. — ^ scales crowded on the stems of 

 the plant, lively red-brown in colour, smooth and rather shiny, subtrans- 

 lucent ; elevated so as to form in outline a triangle, the base of which is 

 greater than either side viewed from one side, but with the sides greater 

 than the base when the scale is viewed from one end. In a lateral view 

 the two sides are about equal and meet each other at a right angle ; all the 

 other angles of the profile, whether taken from the side or from the end, 

 are necessarily less than right angles. 



A more minute inspection shows that the apex of the scale is not a 

 simple pyramid, but consists of a horn or tooth inclined backwards, so 

 that a small but distinct notch appears in the lateral outline on the pos- 

 terior side. This horn gives the whole scale somewhat the shape of 

 certain teeth of sharks. 



^ Viewed from above, the scale is roughly oval in outline, but presents 

 oh each side a slight bulging, before and behind which is a groove or 

 constriction. 



Alt. 2, lat. 2, long. 2^ mm. 



Boiled in caustic soda, the females give a fine bright carmine, like 

 cochineal. 



The young are elongate, bright crimson in colour. 



Adult female circular in outline. The abdominal process appears to 

 be formed of three segments ; the basal one very large, about as long as 

 the breadth of it? base ; the second much smaller, broader than long ; 

 the third or terminal quite small, abruptly truncate. From this terminal 

 portion arise the anal hairs in two bundles of five each ; these hairs are 

 of considerable length. 



The lateral tubes are elongate, of the peculiar structure usually seen 

 in the genus. The glands are arranged in the tubes so that their proximal 

 outline in mass, viewed laterally, forms a portion of a circle, not a pointed 

 cone as in J\ jnelaleiuce. 



This lac- insect was discovered by Prof E. O. Wooton, on a species of 

 Composilae growing on Little Mountain, on the occasion of a recent meet- 

 ing of the New Mexico College Field Club. Little Mountain is in the 

 Mesilla Valley of New Mexico, only a few miles from the Agricultural 

 College. Unfortunately the plant was not in flower, and so cannot be 



