HEMIPTERA— HETEEOPTERA— HYDROBATID^. 353 



I name this interesting species after my lamented friend, Dr. C. Stal, 

 of Stockholm, whose m irvelous industry and keen insight into the structure 

 of Hemiptera is known to all entomologists. 



Three miles up the north fork of the Similkameen River, British 

 Columbia. Three specimens, Nos. 70, 71 and 72, 73. Geological Survey 

 of Canada, G. M. Daw^son, collector. 



2. Telmatrechus parallelus. 

 PI. 4, Fig. 1. 



Two specimens are at hand, neither of them quite perfect. The species 

 diifers markedly from the preceding (with which it agrees in size) in the 

 almost perfectly parallel sides of the abdomen, which is of the same width 

 as the thorax ; it tapers only on the last two segments. The head as seen 

 on a side view is perhaps shorter than in T. stali, and very much smaller 

 than the thorax ; as there, both it and the thorax are minutely scabrous. 

 The whole body is of a tolerably uniform dark testaceous color, and the 

 segments of the middle of the abdomen are about equally long and broad, 

 while in T. stali they are nearly twice as broad as long. 



Length of body, 20"""; breadth of thorax, 2.75"'™; of sixth abdominal 

 segment, 2.25"'™ ; length of fore femora, .5-5.5™"' ; fore tibia?, 5-5.5™™ ; mid- 

 dle femora, 11-13"'™; hind femora, 13-15™"'. 



Twin Creek, Wyoming. Two specimens, Nos. 14601, 15076. 



METROBATES Uhler. 



A single species of this genus is known, inhabiting the eastern United 

 States. A much larger and somewhat slenderer form appearing to belong 

 here occurs in the Florissant beds. It was provisionally referred by me to 

 Halobates before Metrobates was known to me autoptically. 



MeTROBATES yETERNALIS. 

 PL 22, Fig. 15. 



Body considerably elongated, but solely by the prolongation of the 

 mesonotum, which is about twice as long as broad, thus separating at con- 

 siderable distance the fore an.d aftei' legs ; the abdomen is no longer than 

 VOL XIII 23 



