OP WASHINGTON, VOLUME XIII, 1911. 193 



On a rainy day a large number of Anopheles quadrimacn- 

 latns were found sitting on a spider web in a hollow tree. 

 Thinking they must be at least slightly entangled, I counted 

 on capturing them easily. Upon putting my cyanide bottle 

 near one, the whole swarm rose lightly on the wing, not stick- 

 ing to the web at all. By further tests I found they were per- 

 fectly at home on the web. 



Mr. Knab mentioned a cecidomyid having a similar habit, 

 but did not know its name. 



-Mr. Gahan spoke of the nesting habit of Xylocrabro stir- 

 picola Pack, in Catalpa. 



Mr. Walton said he had collected the species in stalks of 

 Sanibitctts, with a trypetid fly, Euresthiacequalis, as host. 



Mr. Rohwer stated that Xylocrahro stirpicola used at least 

 five different species of flies as food for its larvae. 



-Mr. Schwarz gave in an informal way an account of his 

 trip to the Isthmus of Panama as a member of the expedition 

 sent out by the Smithsonian Institution to make a biological 

 survey of the Canal Zone. He was on the isthmus from the 

 middle of January to the middle of May. He gave a historical 

 review of the entomological investigations made in Panama, 

 commencing with the old "Herald" expedition in 1819, dwell- 

 ing further on Col. Motschulsky's visit there in 1853, and his 

 explorations at Bas Obisbo. Dr. John L. LeConte's crossing 

 of the isthmus in 1850 and 1851 was mentioned, and the work 

 of the explorers for the "Biologia Centrali-Americana" was 

 commented upon. Finally the contributions to the knowledge 

 of the insects of that region made by the officers of the Sanitary 

 Department of the Isthmian Canal Commission and the results 

 of the expeditions sent out by the Bureau of Entomology of 

 the U. S. Department of Agriculture was commented upon. 



Mr. Schwarz established his headquarters at Paraiso, which 

 is situated on the Pacific slope, and here the bulk of his col- 

 lection was made, but from this place nearly all stations along 

 the old Panama Railroad were visited. A longer excursion of 

 nearly four weeks' duration was made to Porto Bello, which is 

 situated on the Atlantic Coast, about 22 miles east of Colon. 

 Mr. Schwarz confined his attention to the Coleoptera and 



