310 ENTOMOLOGICAL SOCIETY 



Neuroctenus pseudonemus Bergroth, collected at Bladensburg, 

 Maryland, on March 26, under bark. The species was described 

 originally from " Carolina," and has not before been recorded 

 from the District of Columbia. He showed, also, a specimen of 

 Neuroctenus simplex Say, the species found commonly around 

 Washington. JV. pseudonemus is much the larger of the two 

 forms. 



Prof. Uhler remarked that this species is very large for our 

 fauna, and has an almost tropical appearance. In the tropics 

 some species of Aradidas attain a length of about three quarters 

 of an inch. He mentioned a species described by-Champion 

 from Central America, which lives under fungi, and bears little 

 knob-like protuberances on its pronotum. These serve to scrape 

 off and distribute over the back a powdery material from the fun 

 gus, giving the bug a spotted appearance not natural to it. 



Mr. Banks showed a specimen of a large Syrphid fly ( Ccria 

 willistonii Kahl), and presented the following note : 



NOTE ON CERIA WILLISTONII KAHL. 

 By NATHAN BANKS. 



From a puparium collected on oak bark at Falls Church, 

 Virginia, about the middle of March, there issued on the zyth of 

 March a fly of this species, previously known from Florida, 

 Texas, and Kansas. The fly has a great resemblance to certain 

 conopids, and also to some wasps. It is probably identical with 

 C. signifera Loew from Mexico. The larva of Ceria is sup 

 posed to feed in the flowing sap of trees. I give below a short 

 description of the puparium : 



Puparium dull black above, whitish below, in front with two large white 

 marks separated by a narrow black spot; anal tube shining black. Dor- 

 sum faintly mottled with pale, more prominent on the sides. Dorsum 

 with a median row of double pointed tubercles, and a lateral row each 

 side; those toward the tip are smaller than the others. Length, 18 mm. 



Mr. Banks showed, also, two rare Ortalid flies. The first 

 bears a very close resemblance to an ant, as its name, Myrme- 

 comyia myrmecoides Loew, would indicate. The other species, 

 Odontomera ferruginea Macquart, also looks much like an ant, 

 though the resemblance is not so striking. The latter was from 

 the District of Columbia. 



