Tune, 191 1.] Proceedings of the Society. 129 



Dr. E. B. Southwick exhibited specimens of an orchid, the pseudobulbs of 

 which were infested with a small South American hymenopterous insect, Iso- 

 soma orchidarnm, a well-known pest of greenhouse orchids both in this 

 country and abroad. 



Mr. W. T. Davis exhibited a fly Spilomyia quadnfasciata taken by him- 

 self on Staten Island some years ago. 



C. L. PoLL.'iRD, 



Secretary pro tern. 



Meeting of Tuesd.w, M.\rch 13. 1910. 



Held at the American Museum of Natural History. President C. W. Leng 

 in the chair with eighteen members and one visitor in attendance. 



The librarian, Mr. Schaeffer. reported the receipt of the following ex- 

 changes : 



Wiener Entomol. Zeitung, XXIX, Nos. 2, 3. 



Verhandlungen d. K. K. Zool. Bot. Gesellschaft, Wien. LIX. Nos. 7. 8. 



Some Bees of the Genus Augochlora from the West Indies, T. D. A. 



Cockerell. 



Zeitschrift f. Wissenschaftliche Insekten-biologie. VI, No. 2. 



Insects Injurious to Sweet Potatoes in New Jersey, T. B. Smith. 



Bull, de la Soc. Entomol. d'Egypt. 1909, No. 3. 



Canadian Entomologist, XLII, No. 3- 



Coleoptorum Catalogus, Part 9 and 10. 



Through the president the curator reported that the preliminary arrange- 

 ment of the Diptera was partially completed and cabinets to contain these and 

 the Hymenoptera had been ordered. 



Mr L H Joutel under the title of " A Scarabaeid new to Long Island,- 

 stated that among a catch of Long Island beetles made by Mr. Engelhardt 

 there were two specimens of Trichius tcxanus Horn, one of which he ex- 

 hibited with a male of T. piger. He pointed out the differences in the males 

 of the two species and called particular attention to the great difference in 

 the front tibia. In texa,m it is very broad, while in piger it is quite narrow. 

 He also referred to the differences in the punctures of the thorax of the two 



Fpecies. ^ 



Dr J L. Zabriskie with the aid of lantern slides spoke on the ' Micro- 

 scopical Examination of some Structures of the beetle Bruehus discoideus 

 Say " The antennal structure of the male and female were shown and dis- 

 cussed special mention being made of the short spine at the apex of the last 

 segment of the male antennae. Other parts, which were shown and com- 

 mented upon were the mandibles, two pairs of maxilL-e. the peculiar emargina- 

 tion of the eye in which the base of the antenna rests, the legs and details 

 of structure of coxa, trochanter and tarsus, inside view of segments of pro- 

 thorax to show internal bracing chitinous rods, tergites of abdomen and 

 sculpture of elytra. 



Mr. William T. Davis stated that he had recently examined numerous 



