330 THE CANADIAN ENTOMOLOGIST 



Mycetococcus, n. gen. 



Coccidse referable to the tribe Asterolecaniini of the sub- 

 family Dactylopiinae (of the Fernald Catalogue). Adult female 

 apodous and with the antennae reduced to mere unsegmented 

 tubercles. Body top-shaped, ending in a pair of prominent lobes, 

 which, together with the last segment of the abdomen, are heavily 

 chitinized. 



Type of the genus: Cerococcus ehrhorni Ckll. Cerococcus 

 corticis Towns, and Ckll., also included. 



Notes. — The description here given will doubtless appear 

 extremely short, but the characters enumerated are the only ones 

 that the two species included have in common. Although the 

 two are very similar in general appearance and occur upon ho&ts 

 of the same genus, I am unable to avoid the conviction that they 

 are not congeneric and perhaps should not even be referred to the 

 same group. It has seemed best, however, to place them together 

 until the value of the characters that seem to separate them has 

 been more fully investigated. These differences will be discussed 

 under the. species. Neither of the species can be considered as 

 having anything in common with the genus Cerococcus to which 

 they have been referred. The first stage larvae are very different 

 from those of typical Cerococcus, the adults lack the "cauda" be- 

 tween the anal lobes and the cribriform plates of the latter genus 

 while the heavily chitinized anal lobes and terminal segment of 

 the abdomen are quite distinctive. 



Mycetococcus ehrhorni (Ckll.). 

 (Fig. 15 A.) 



1895. Cerococcus ehrhorni Ckll. Psyche, vol. 7, p. 255. 



1901. Cerococcus ehrhorni Ckll.; Patterson, Proc. Calif. Acad. 

 Sci., ser. 3, vol. 2, p. 387, pi. 22, figs. 1-9. 



A sufficiently accurate general description of the insect will 

 be found in the papers of Cockerell and Patterson, but there are 

 certain details that have been overlooked. 



The derm in the adult female bears numerous small, 8-shaped 

 pores and a very few, extremely minute and delicate tubular ducts 

 that appear to be of the type common to the Asterolecanine forms. 



