THE CANADIAN ENTOMOLOGIST. 359 



In 1907 I proposed a classification of two superfamilies in each main 

 division, and six families in each superfamily. My friend, Dr. Bergroth 

 (/;/ ////.), suggests that in the Cimicoide?e, the Cimicidne form a superfamily, 

 the Tingid?e another, the remaining three famihes another. This is very 

 probably more correct, but it has this objection, viz.: that its adoption 

 would obscure the much closer mutual relationship between these three 

 "superfamilies" than between any of them and the Nepoideae. Since 

 proposing the above classification, I have acquired some specimens of 

 Urosiy/is, which was previously unknown to me in nature. This genus 

 seems to me to be a very aberrant Cimicid, and in some respects to be 

 more allied to the Lygaeidse. At present I propose to establish eight 

 families in the Cimicoideae, viz.: Cimicid?e, Cydnidse,* Urostylidae, Aradidae, 

 Lygieidas, Pyrrhocoridce, Myodochidse ( = Geocoridae) and Tingidae. The 

 Tessaratomin^ lead to the Aradidoe, the Urostylidje to the Lygaeidpe. 

 More study of nymphal characters in Cydnidae and UrostylidEe is needed, 

 indeed, in all the families. 



My classification may stand for the present as follows : 



Superfamily I. — Cimicoide^. 



1. The articulation of the antennae with the head, concealed from above. 



Ova deposited externally. Nymphs, in the last instar at least, with 



three orifices (on the 4th, 5th and 6th tergites), the first of which is 



sometimes paired. [Scutellum nearly always greatly developed.]. 2. 



la. Antennae not thus concealed. Scutellum mediocre or small .3. 



2. Abdominal segments normal. Tibiae not spiny i. Cijfiicidce. 



2a. Only five sternites clearly seen (exclusive of genital segments). Tibiae 



spinose 2. Cydiiid(B. 



3. Tarsi consisting of three segments < 4- 



3a. Tarsi consisting of two segments 7- 



4. Antennae with five segments ;t general habitus Cimicidiform [meta- 



morphoses unknown] 3. Urostylidce. 



"I am indebted to Dr. Bergroth for calling my attention to certain charac- 

 ters in this. 



tl have now received a Chinese form with only four segments, which I shall 

 describe as Tessaromems. 



