228 THE CANADIAN ENTOMOLOGIST. 



already have indications of the curious distoition peculiar to certain of its 

 species. The single specimen on a point, already referred to, is another 

 nymph, somewhat smaller than the fourth, of Metrobates hesperius Uhler, 

 very much shrunken and mutilated, having left only portions of three 

 legs, the left anterior and right middle and posterior. The fourth speci- 

 men, on a very rusty and verdigrised pin, bears a printed localitv label 

 "Sherbrooke, Can.," and on another small label "418," in pen and ink. 

 This is a male, more or less greasy and shrunken (the latter, by-the-bye, 

 an evidence of immaturity), and has left to it only one whole and three 

 half legs, the former being the right anterior, and the latter the femora of 

 the left anterior and both posterior legs. The antennae also are absent. 

 The structure of the head, however, shows its affinities, and it agrees with 

 nymphs in the 3rd or 4th instar of Metrobates hesperius Uhler. 



It naturally foUovv^s from the preceding that Halobatopsis Bcginii 

 Ashm , has no real existence as a biological unit, in that it is a composite 

 of two known species in as many different and unrelated genera, its only 

 claim to attention being that it is an addition to our synonymies. 



My valued friend, Mr. Otto Heidemann, of Washington, D.C, at the 

 time these specimens were sent to me for study, called my attention to 

 their being nymphs of Metrobates and Rheujnatobates, and it is with 

 peculiar pleasure that I make known here his independent arrival at this 

 conclusion, the correctness of which a glance at the specimens made 

 evident, and which careful study subsequently amply confirmed. 



The synonymy of the two genera and species involved may now be 

 corrected to read as follows : 



Metrobates Uhler, 1871. 



Proc. Bost. Soc. Nat. Hist., XIV, 108. 



= Halobatopsis Ashmead, 1897, Can. Ent., XXIX, 56 (not 

 Bianchi), [in part, for nymphs]. 

 Hesperius Uhler, 187 i, I.e. 



= Bcginii A?\\m. (Halobatopsis), 1897, I.e. [in part, nymphs of 

 this species described as adults], 

 Rheuniatobates Bergr., 1892. 

 Ins. Life, IV, 32 i. 



= Halobatopsis Aslimead, 1897, ^^- ("<^^ Bianchi), [in part,, 

 for ^ nymph]. 

 Rileyi^txgx.^ 1892, I.e. 



= Bcgi?iii Ashm. (Halobatopsis), 1897, I.e. [in part, for ^ 

 nymph described as adult]. 



