Article XI.— .4 Ched--L{{it of the CoccidcB. By T. D. A. 

 CocKERELL, J^eio Mexico Agricultural Experiment Station. 



Anyone who will take the trouble to peruse the " Zo- 

 ological Record" will see that the present is a time of 

 unusual activity among coecidologists. In the last vol- 

 ume to hand, that for 1893, nearly four page.-? are oc- 

 cupied by the abstract of the literature on this family, 

 as against three pages for the rest of the Homoptera ! 

 Before many years have passed, the Catalogue general 

 des Hemipteres of M. Severin will have reached the Coc- 

 cidae, and we may then expect to be presented with an 

 elaborate bibliographical index to the group. In the 

 meanwhile the works of Signoret, Comstock, Maskell, and 

 the forthcoming list of American Homoptera by Ash- 

 mead, will greatly assist us in reviewing the subject; but 

 I have thought that a check-list, complete to date, would 

 be a noteworthy convenience at the present time. 



In preparing this list I have consulted almost all the 

 recent works, but for many of the older ones have been 

 obliged to rely on the information given by Signoret. A 

 list of the one hundred and twenty-four persons who 

 haA^e named genera, species, or varieties of Coccidae is 

 appended, with the dates on or between which their writ- 

 ings pertinent in this connection were published. For 

 the older works, the dates may not in all cases be per- 

 fectly correct, as those given by Signoret and Hagen do 

 not always agree. The numbers in parentheses after the 

 authors' names indicate the number of valid species 

 described bv each. 



