OF WASHINGTON. 303 



made, and had always found young spiders instead of eggs. He 

 thought that some species might be viviparous. Various other 

 members stated that they had always been able to* find eggs in 

 spider cocoons. 



Dr. Stiles made some remarks on the Nematode parasites of in 

 sects, stating that there were three genera, Mermis, Gordius, 

 and Oxyura, which are frequently confused by entomologists. 

 He thought that entomologists should be more careful in naming 

 the species which they chance to observe, so that helminthologists 

 may have more accurate data for reference. 



Prof. H. E. Summers was invited to speak, and made some 

 remarks on collecting, particularly in the tropics. He thought 

 that entomologists should be much more careful and exact, both 

 as regards locality and date, as upon these facts much of our 

 knowledge of the life of insects depends. He illustrated his 

 points by reference to several interesting personal experiences in 

 Trinidad and Venezuela, and particularly emphasized the neces 

 sity of a prolonged stay and close collecting even in limited areas 

 in tropical countries on account of the narrow distribution of 

 many forms. He insisted upon the consequent value of very exact 

 locality labels. 



MARCH 3, 1892. 



President Riley in the chair. Eighteen members and one 

 visitor present. 



Mr. Wm. Ross Harris was elected a corresponding member. 



Dr. Stiles discussed the histology of Boophilus bovis (Riley) 

 Curtice, illustrating his paper with microscopic preparations. 

 He has furnished the following abstract : 



THE HISTOLOGY OF BOOPHILUS. 



BY C. W. STILES, PH. D. 

 [Author's Abstract.^ 



The subjects treated were : the structure of the exterior cuticle ; 

 the presence of more than one pair of stigmata in the larva ; the 

 structure of the hypodermis ; the peculiar large cells with enor 

 mous star-shaped nuclei, derived from the hypodermis and serv- 



