the; mycetopiiilid.i; of north America. 231 



5. Syniincnis aiiinilata Aleigen. 



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



(Plesiastina). 



Male and female. Length 7 to 7-i- 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. Symmcriis lauta Loew. 



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



(Plesiastina). 



Male. Length 4-I- to 6 mm. Pale yellow. Flagellum of 



antenna fuscous black; vertex in large part black. IMesonotum 



shining with 3 black vittas, 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 ; h3'popygium 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 M: subequal. 



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



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



August 24. 



3. Subfamily Diadocidiin.^. 

 Diadocidiiicr. Winnertz. \^erh. 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. 

 Diadocidia Ruthe, Isis. II. 1210. .1831. 

 Macroncura, IMacquart, Suites a Buffon I. 146. 1834. 



