222 coccus. 



Cockerell, and myself, is a much smaller insect than 

 the species now considered to be the true C. cacti ; but 

 otherwise it possesses all the salient characters of the 

 larger species, and may in every sense be considered 

 typical of the genus and a true cochineal insect. 



The genus Coccus is a very distinct one, and may be 

 denned as follows : 



Adult female. The somewhat degenerate antennae 

 consist of from five to seven joints, but the number 

 varies slightly in individuals of the same species. The 

 legs are well developed, but somewhat short. The 

 dorsal dermis in all the species possesses truncate spines 

 and irregularly grouped compound spinnerets as in 

 the Diaspina3. But the most salient feature of the 

 female is the complete absence of hairs or spines at 

 the anal orifice ; and there is no trace whatever of the 

 anal lobes ; they are not even indicated by single hairs, 

 as is always the case with the Dactylopiina?. 



The larva (PL LXXIII, figs. 11,12) possesses dorsal 

 truncate spines, but they are arranged in longitudinal 

 rows. The anal orifice is also without hairs or spines, 

 and there is no indication or trace of anal lobes. 



The male is characterised by the singular two- 

 jointed tarsi (fig. 10), which are, I believe, a unique 

 character among male coccids. 



Coccus acacise, Mask., has been removed from the 

 genus by Mr. Cockerell * and made the type of his 

 genus Epicoccus, the female of which differs from that 

 of the true Coccus in having well-developed antennas 

 and legs, and small inconspicuous anal tubercles. The 

 larva also possesses " prominent but small " anal 

 tubercles, a character which at once separates it from 

 the genus Coccus. 



* ' Ann. Nat. Hist./ ser. 7, vol. ix, p. 25. 



