THE MYCE;TOPHII.ID.'Ti 01? NORTH AMERICA. 23 1 



5. Symmcrus annulata Meigen. 



1830. annulata Meigen, Syst. Beschr. VI. 294. 3. 



(Plesiastina). 



Male and female. Length 7 to y^ mm. Palpi and face 



yellow ; front and vertex fuscous ; antennae brown, the scape 



and sometimes the basal flagellar joints yellow. Thorax and 



abdomen yellow, shining, the latter somewhat compressed, with 



posterior half or two-thirds of each segment fuscous. Coxae 



and legs yellow, tarsi infuscated; fore tibia only slightly longer 



than the fore metatarsus ; all femora; ciliated beneath. Wings 



grayish hyaline, costal cell more ferruginous ; veins brown ; 



subcosta a mere tooth. Recorded from New Jersey and New 



Hampshire. 



6. Symmerus lauta Loew. 



1869. lauta Loew, Berl. Ent. Zeitschr. XIIL 132. 3. 



(Plesiastina). 



Male. Length 4^ to 6 mm. Pale yellow. Flagellum of 



antenna fuscous black ; vertex in large part black. Mesonotum 



shining with 3 black vittae, the median vitta paler anteriorly 



and divided by pale line ; pleura immaculate. Tergum of each 



abdominal sclerite blackish with pale anterior and posterior 



margins, venter wholly pale yellow ; hypopygium brownish, 



stout, superior forceps black, shorter than the inferior forceps. 



Legs pale yellow, tibial spurs black, tarsi infuscated. Wing 



tinted with cinereous ; petiole of the media and M2 subequal. 



Halteres yellow ; knob infuscated. Recorded from N. Y. A 



defective specimen from Ithaca, N. Y., bears the date 



August 24. 



3. Subfamily Diadocidiin.^. ^ 

 Diadocidincc. Wlnnertz. Verb. Zool.-bot. Ges. Wien. XIIL 



656. 1863. 

 This subfamily is distinguished from all others in having the 

 M-Cu crossvein present and at the same time only 2 branches 

 of the radius. 



Genus Diadocidia Ruthe. h 

 Diadocidia Ruthe, Isis. II. 1210. 1831. 

 Macroneura, Macquart, Suites a Buffon I. 146. 1834. 



