OF WASHINGTON. 83 



genus Strongylium, but stated that some doubt as to this reference 

 arises from the fact that all the species of Strongylium are much too 

 large for any of the larvae so far found. Mr. Schwarz also called 

 attention to the frequent confusion by collectors of Serropalpus 

 and Lymexylon, describing the distribution of the two genera, 

 the first being confined to the northern and the second to the more 

 distinctively southern States in range. Specimens of the two 

 genera were also exhibited. 



Dr. Riley was greatly interested in the burrow of the Agrilus 

 exhibited by Mr. Hopkins, which had become filled up with a 

 growth of -liber so as to make the burrow a raised ridge, and, from 

 its serpentine course, gave it somewhat the appearance of a ligni- 

 fied snake. In connection with this he referred to the very curious 

 so-called lignified snake from Brazil, which was exhibited in 

 Europe some years ago, and which was so natural in appearance 

 as to deceive several European writers, but which was really but 

 another example of the burrow of an insect afterwards filled up 

 by a woody growth like the one exhibited. Mr. Hopkins stated, 

 in connection with the work of this insect, that the tree in which 

 the specimen was obtained was in a dying condition, but was 

 evidently being killed by the attacks of the Agrilus, which affects 

 living and growing trees rather than those already injured or in a 

 dying condition, as is sometimes thought. 



NOVEMBER 2, 1893. 



President Riley in the chair, and twelve members present. 

 Mr. Heidemann presented designs for a seal for the Society. One 

 of the designs was adopted, and Mr. Heidemann was urged to 

 engrave it upon wood. Upon motion, a vote of thanks was ex 

 tended to Mr. Heidemann for his voluntary services in this mat 

 ter. 



Prof. Riley read the following : 



NOTES UPON BELOSTOMA AND BENACUS. 

 BY C. V. RILEY. 



It is well known that for many years the commoner species of 

 our so-called "electric light bug" was generally referred to 



