30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loa 



Rivellia conjuncta Loew 



FiGXiKE Q,g-j 



Rivellia conjuncta Loew, 1873, p. 88, pi. 8, fig. 3 (not Rivellia conjuncta Loew of 

 Van Der Wulp, 1898).~Hcndel, 1914a, p. 176. 



The species thought to be R. conjuncta by Van Dor Wulp in 1898 

 was recognized by Hendel (1914a) and by Cresson (1924) to be an- 

 other species. Hendel names the species R. wulpiana, and Cresson, 

 who apparently had no knowledge of Hendel's paper, named the same 

 species R. vandenoulpi. R. vanderwulpi Cresson, is, therefore, a junior 

 synonym of R. wuljnana Hendel. 



Type: The type of this species has been destroyed. It was col- 

 lected LQ Maryland and was formerly deposited in the Museum of 

 Comparative Zoology. 



Males: Body length 3.5-5.0 mm. 



Head : Frons yellowish brown or reddish brown ; upper fronto-orbital 

 plates and ocellar triangle blackened; pruinose strip on frontal orbits 

 perceptibly broader than those of other Rivellia. Face with little 

 more than dorsal half pruinose, remainder shining, smooth, dark brown 

 or black medioventrally with brownish yellow lateral strip on each 

 side terminating just before the oral margin; parafacials and part of 

 orbits ventral to each eye brownish yellow. Antenna with first and 

 second segments yellow; third segment with tip, outside, and anterior 

 side of inside blackened, remainder j^ellow, the tip pointed anteriorly. 

 AntecljTDeus concolorous with medioventral portion of face. Palpi 

 yellow. Postcranium black, pruinose. 



Thorax: Mesonotum dark brown or black; strong humeral and 

 posterior dorsocentral setae present. Scutellum and postscutellum 

 concolorous with mesonotum. Pleura dark brown or black, mosth^ 

 shining. Mesopleuron with scattered black setae on posterior half; 

 pniinosity at dorsal posterior corner absent. Sternopleuron with 

 narrow pruinose strip on ventral margin; disc with scattered black 

 setae. Hj^poplem'on with shining disc, borders narrowly pruinose. 

 Laterotergite completely and densely pruinose. Prosternum black. 



Thoracic appendages: All legs with coxae, femora, and tibiae dark 

 brown or black; front tarsi blackened from third segment, remaining 

 segments yellow; middle and hind tarsi blackened from fourth seg- 

 ment, remaining segments yellow. 



Wing (fig. 6,g) length 3.1-3.7 mm. Bands dark brown, very 

 broad. First and second bands widely separated at costal margin, 

 joined broadl}^ posterior to third vein; third and fourth bands broadly 

 joined at costal margin. First basal cell almost completely banded; 

 the apex of the hyaline triangle between first and second bands ends 

 anywhere between third and fourth vems. Second basal cell com- 

 pletely banded. Discal cell completely banded at base. First and 



