208 PROCEEDINGS OP THE ACADEMY OF 



Proboscis, palpi and antennae black ; front and vertex cinereous. Thorax 

 cinereous, with three distinct black stripes, the intermediate one extends over 

 the collare; the lateral ones are abbreviated before; pleurae, scutellum and 

 rnetathorax hoary ; halteres pale at base, dusky at tip ; coxae and basis of femora 

 pale ; the rest of the feet more or less dark tawny. Abdomen brown ; $ forceps 

 paler. Wings slightly infuscated ; stigma of an irregular oblong form, pale 

 fuscous ; a slight nebulosity at the origin of the petiole ; the mediastinal vein 

 joins the costal nearly opposite the origin of the petiole ; the atigmatical cross- 

 vein forms with the tip of the subcostal vein an obtuse angle (sometimes ap- 

 proaching a straight line) ; the cross-vein is situated near the posterior end of 

 the stigma. 



$ and 9 specimens from Trenton Falls, (nob.) The proboscis (including 

 the haustellum) of this species, are shorter than those of G. communis. 



2d Section. 



Rhipidia Meig. 



Antennae bipectinated or moniliform in the rj\ moniliform in the 9 



The other characters, as well as the neuration of the wings, and the form of 



the (^ forceps (see the figures 8 and 9 of the plate) agree with my 3d section, 



(Dicranomyia Steph.) 

 I have altered the generic character of this genus as it was adopted by 



Meigen ("antennae maris bipectinatae"), in order to include in it two new 



species, which are closely allied to R. maculata, but have moniliform 



antennae in both sexes. 



Analytical Table. 



1. Antennae bipectinated in the ^J 1 , moniliform in the 9; wings densely spotted 



with small pale brown spots. R. maculata Meig. 



Antennee moniliform in $ and 9j or only subpectinated in the $; wings with 



some brown spots along the anterior margin. 2. 



2. Antennae black. R. fidelis nob. 

 Antennas with the two penultimate joints yellow. R. domestica nob. 



R. maculata. Cinerea-fusca, thorace vitta brunnea, alis fusco maculatis 

 et nebulosis ; long. lin. 2|-4. 



Meig. Eur. Zweifl. i. p. 153. 



Front and vertex dark cinereous ; proboscis, palpi and antennae black. 

 Thorax yellowish cinereous with a broad brown stripe in the middle ; lateral 

 stripes short and indistinct on the praescutum, although extended over the 

 scutum; scutellum and rnetathorax with brown lines in the middle; halteres 

 pale ; feet tawny ; coxae and base of femora pale ; a brown ring before the 

 tips of the latter ; tip of tibiae brown. Abdomen brownish. Wings cinereous, 

 densely covered with pale greyish brown spots and small round dots ; four 

 larger and darker spots along the anterior margin; the 1st near the base, the 

 2d a little beyond it, the 3d near the origin of the petiole; the 4th at the tips 

 of the subcostal vein ; central and lower discal cross-veins clouded ; a round 

 spot at the lips of the axillary vein. 



Two $ and 9 fi ve specimens. White mountains in September; Trenton Falls 

 in June (nob.); Maine (Mr. Packard); Illinois (Mr. Kennicott). 



One of the 9 specimens is somewhat different from the others in the picture 

 of the wings ; the larger spots and the nebulosities on the cross-veins are very 

 dark; the smaller dots, on the contrary, are not so dense as usual, leaving 

 large hyaline intervals between them. 



Although I have no European specimens of Rhip. maculata for com- 

 parison, I do not doubt of the specific identity of the American specimens. 



R. domestica. Antenna? nigra;, articulis reniformibus, subpectinatis; 



[Au 



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