48 DIPTERA OF NORTH AMERICA. [PART IV. 



o . ( A single submarginal cell Gen. XXXII. Cladolipes. 



( Two subinarginal cells; Tab. II, fig. 12. Gen. XXXI. Anisomeka. 



f The stigma occupies nearly the whole space between the tip of the 

 auxiliary vein and the marginal cross-vein ; pubescence of the 

 wing-veins hardly perceptible. Gen. XXXllI. Ekiocera. 



The stigma occupies but a small portion of the space between the tip 

 of the auxiliary vein and the marginal cross-vein ; pubescence 

 of the wing-veins distinct. Gen. XXXIV. Penthoptera, 



37 



Section VI. Amalopina 

 38 { 



Antennae 16- or 17-jointed. 39 



Antennae 13-jointed. 41 



„Q ( Four posterior cells ; wings pubescent. Gen. XXXVII. Ula. 



( Five posterior cells ; wings glabrous. 40 



^ The small cross-vein is nearly at right angles with the longitudinal 

 axis of the wing ; last joint of the palpi not longer than the two 

 preceding joints taken together. Gen. XXXV. Amalopi.s. 



40 ■! The small cross-vein is in a very oblique direction with regard to the 

 longitudinal axis of the wing, and in one line with the great 

 cross-vein ; last joint of the palpi longer than the three preceding 

 joints taken together. Gen. XXXVI. Pedicia. 



C Two cross-veins between the first longitudinal vein and the anterior 

 branch of the second vein ; Tab. II, fig. 16. 



41 \ Gen. XXXVIII. Dicranota. 

 I Only one cross-vein between the first longitudinal vein and the an- 

 [ terior branch of the second vein. 42 



-r, ( Four posterior cells; Tab. II, fig. 18. Gen. XXXIX. Plectromyia. 



"^ ( Five posterior cells; Tab. II, fig. 17. Gen. XL. Rhaphidolabis. 



Section VII. Cylindrotomina. 



/ Head and intervals of the thoracic stripes with dense, deep punctures. 

 43) Gen. XLII. Triogma. 



' Head smooth. 44 



.. ( Coloring of uPachyrhina : yellow and black. Gen. XLI. Cylindrotoma. 



I Coloring of a rZ/Ju/a; brownish and grayish. Gen. XLIII. Phalacrocera. 



Section VIII. Ptychopterina. 



/First submarginal cell much shorter than the second. 

 45 \ Gen. XLVI. Protoplasa. 



' Second submarginal cell much shorter than the first. 46 



^f. ( Three posterior cells ; Tab. II, fig. 20. Gen. XLV. Bittacomorpha. 



( Four posterior cells ; Tab. II, fig. 19. Gen. XLIV. Ptychoptera. 



