72 Psyche [August 



Belg., p. 153, 1913) has more recently advocated the union of the 

 Lethseini and Rhyparochromini in the following words: "After 

 examination of many specimens of Microcoris and other exotic 

 Myodochinse I believe, however, that the number and position of 

 the glandular spots have been overrated as a systematic character 

 by Stal. One or other of these spots is sometimes lacking, at 

 least on one side of the body. I therefore unite the Lethsearia 

 with the Rhyparochromaria. . . ." 



After a careful study of all the United States genera, in prepara- 

 tion for my revision of this subfamily, I am convinced that, so 

 far at least as our fauna is concerned, Stal's divisional diagnosis 

 will apply in separating the genera off into well defined groups. 

 However my knowledge of palrearctic and exotic genera of Rhy- 

 parochrominse is too limited, at the present time, to permit me to 

 determine how well this scheme applies beyond our limits. Hence 

 without more evidence than we have at the present time I am 

 reluctant to abandon Stal's scheme of divisions. 



As it is obviously impossible, in a paper of this character, to 

 enter into explanations, I have found it necessary to publish else- 

 where such modifications of or additions to the present scheme, 

 which I have here proposed. It will be noted that although I have 

 adopted Stal's divisions I have modified the wording somewhat, in 

 order to bring out the relative importance or the greater signifi- 

 cance of certain characters. Attention must also be called to the 

 fact that the species mentioned in connection with certain genera 

 is not necessarily the type unless so indicated. 



Key to the Tribes of Subfamily RnYPAROCHROMiNiE. 



A. The two basal segments of the rostrum together not at all or 

 scarcely longer than the head, third segment longest of all. 

 Posterior glandular opaque spot of the fourth ventral seg- 

 ment remote from the apical margin. Ocelli very widely 



separated Cleradini StS,l. 



AA. The two basal segments of the rostrum much longer than the 



head, the first segment as long or nearly as long as the head. 



Ocelli not so widely separated. 



B. With the two glandular opaque spots laterally on the fourth 



ventral segment, widely separated, the posterior one placed 



closer to the posterior margin than to the anterior spot. 



