1913] Wheeler — A Giant Coccid from Guatemala 31 



proportion, much more broadly rounded so that the areuation of the angles involves 

 the front border to the extent of loss of the straightness of the anterior margin. 

 The elypeal disk is much less strongly punctured and the concavity is more pro- 

 nounced. Frontal suture strongly carinatc, fr< nt and vertex less punctured than in 

 A. camancha. Prothorax with the sides a little divergent, the posterior angles 

 slightly everted, while in A. camancha the sides converge a little posteriorly and the 

 angles are not everted. Pronotal discal punctuation finer, and more scattered. 

 Elytra! strial punctuation a little more pronounced than in A. camancha, but that 

 of the intervals much less so, the broadest interspace, next to the sutural stria, 

 having a rather irregular single series only. Pygidium finely and very sparsely 

 punctate. Claw structure almost identical with the preceding species. Length 

 12.25 mm. 



Described from a single specimen, collected by myself, July 

 9, at El Paso, Texas. 



This, too, is a Rhombonyx, differing at once from A. camancha 

 in the cariniform frontal suture, agreeing in this character with 

 A. carinifrons Bates and A. cavifrons Lee. From the former, it 

 may be told by the thoracic punctuation ("sat dense et fortius" 

 in A. carinifrons), the single punctate series on the subsutural 

 interval and the distinct though not very strong dilatation of the 

 major anterior tarsal claw. From cavifrons, it separates by the 

 larger size, the punctate elytral intervals and the shape of the 

 prothorax. 



A GIANT COCCID FROM GUATEMALA. 



By William Morton Wheeler, 

 Bussey Institution, Harvard University. 



The Coccidse are usually described in our entomological text- 

 books as "small" or "minute" insects, and this is certainly true 

 of the species of temperate regions. In the tropics, however, where 

 the family is most abundantly represented, there are several large 

 forms which make their congeners look like pygmies. For exam- 

 ple, the adult female of Hemilecanium theobromce Newstead, one 

 of the species found on cacao in Cameroon, West Africa, is 13—15 

 mm. long and 12-13 mm. wide. 1 



1 Newstead, On a Collection of Coccidae and Other Insects Aftecting Some Cultivated and 

 Wild Plants in Java and in Tropical Western Africa. Journ. Econ. Biol. Ill, No. 2, 1908, pp. 

 33-42, 2 pis. 



