June, 1913-] Proceedings of the Society. 175 



Niceville in Malayan genera Geridus, Alotinus, etc., presumably for the pur- 

 pose named by Mr. Grossbeck. 



Mr. Davis exhibited a number of specimens from his collection illustrat- 

 ing parasitism and allied subjects, among which were Cordyceps raveiielii, a 

 remarkable fungus on beetle larva ; larvs of Diptera found on land turtles in 

 positions back of the neck or back of the legs where the host cannot dislodge 

 them, making a hole m some cases as large as an English walnut and causing 

 the death of the turtle from exhaustion, in other cases falling to the ground 

 to pupate and leaving the turtle as good as ever ; also three species of Cuterebra 

 infesting rabbits ; dipterous larvze from the ear of a red-shouldered hawk ; and 

 Gordius worm from Hemileuca caterpillar. 



Mr. Dickerson spoke of the little parasites less than ^^ inch long in cot- 

 tony maple scale, exhibiting two forms known by different names, Coccophagus 

 flavo-scuteUuni, the summer brood, and Coccophagus lecanii in hibernating 

 scales, but possibly identical. He said also that while the Cynipidse usually 

 made galls, one species was known to be parasitic on cabbage maggot and sup- 

 plied a further instance of eggs laid in host eggs. He referred also to the 

 immense numbers in which parasites sometimes occurred in nature, for in- 

 stance, the fall army worm might be 99 per cent, parasitized causing it to be 

 almost missing the following year, and Scolia dubia, the wasp parasite of white 

 grubs, had been seen in large numbers flying over a lawn at Hammonton, 

 N. J., Vni, 27. 



Dr. Lutz commenting upon the sloth parasites said the sloth has algse on 

 its hair in sufficient quantity to change the color of the hair and probably suffi- 

 cient to supply the parasitic food. 



Dr. Lutz exhibited a collection of Hippoboscids, degenerate Diptera, 

 those feeding on sheep being destitute of wings. They are more abundant 

 on birds, some on bats and few on mammals. 



Dr. Osburn summarized the parasitic forms of Diptera, referring par- 

 ticularly to Vohicella and Microdon as inquilines, Eristalis as occasionally 

 found in human intestines, Muscidae in wounds and nostrils, CEstridae causing 

 warbles, etc. He spoke of the Conopidse as all parasitic, being rapid flyers, 

 laying their eggs on flowers whereby they might be carried to the nest by 

 bees ; and commented upon the rapidity with which winged forms of Hippo- 

 boscidae leave the host after its death. He also referred to Chigoes, Culicidae 

 and Black Flies and the great variety of adaptations to be noted in parasites 

 on different hosts, adaptations often paralleled in different orders. 



Mr. Davis donated photographs of the field meeting of February 22. 



