[885.] NEW-YORK MICROSCOPICAL SOCIETY. 155 



PROCEEDINGS. 



Meeting of May ist, 1885. 

 The President, Mr. C. Van Brunt, in the chair. 

 Twenty-five persons present. 



Mr. J. C. Lathrop was elected an Active Member of the 

 Society. 



objects exhibited. 



1. Triceratiuin Davyaiium^ Greville, a rare and beautiful dia- 

 tom, from Barbadoes deposit ; mounted by Mr. C. Febiger : by 

 C. Van Brunt. 



2. Naviaila Silliinanoruvi, from Crane Pond, Mass.; mounted 

 by Mr. J. A. Bagley : by Walter H. Mead. 



3. Plumatella : by A. D. Balen. 



4. Closteriuni, and Nostoc : by W. G. De Witt. 



5. Triungulin larva of the Narrow-necked Oil-beetle {^Meloe 

 angusticollis. Say), a parasite of AntJiophora : by J. L. Zabriskie. 



6. ^entmayer's Abbe Condenser : by C. S. Shultz. 



7. Dynamo-Electric Machines, for use in microscopical illumi- 

 nation : by G. F. Kunz. 



TRIUNGULIN LARVA OF MELOE ANGUSTICOLLIS. 



The Rev, J. L. Zabriskie : " The Oil-beetle {Meloe angusti- 

 collts, Say) takes its name from its habit of emitting an oily fluid 

 from the joints of its legs. The insect is of a dark-blue color, 

 has very short wing-covers, and a large, soft abdomen. It is 

 remarkable for passing through seven stages of transformation ; 

 viz., the egg, the triungulin, or first larva, the second larva, the 

 false pupa, the third larva, the pupa, the imago. The first larva 

 is called triungulin because each foot looks as if it had three 

 claws. What seems the middle claw Ts an enormously developed 

 foot-pad. In form this larva resembles a louse. The three 

 thoracic segments are nearly equal in size, flattened, transversely 

 oblong, and in the back of the middle segment, near the median 

 line, is the first pair of spiracles. The tip of the abdomen is 

 furnished with two pairs of setae, of which the inner is much 

 longer than the outer. I captured my specimen on one of our 

 native bees of the genus Andrena. 



