48 DIPTERA OF NORTH AMERICA. [PART IV. 



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



( Two submarginal cells ; Tab. II, fig. 12. Gen. XXXI. Anisomera. 



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



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



„h . wing- veins hardly perceptible. Gen. XXXIII. Eriocera. 



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. 



Section VI. Amalopina. 



£g ( Antennae 16- or 17-jointed. 39 



\ Antennae 13-jointed. 41 



qq ( 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. Amalopis. 



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

 longitudinal axis of the wing, and*m one line with the great 

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

 joints taken together. Gen. XXXVI. Pedicia. 



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

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

 £1 J Gen. XXXVIII. Dicranota. 



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

 terior branch of the second vein. 42 



42 ( Four posterior cells ; Tab. II, fig. 18. Gen. XXXIX. Plecteomyia. 

 1 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 



M J Coloring of a Pachyrhina : yellow and black. Gen. XLI. Cylindrotoma. 



Coloring of&Tipula: brownish and grayish. Gen. XLIII. Phalacrocera. 



Section VIII. Ptychopterina. 



/•First submarginal cell much shorter than the second. 

 45 ) Gen. XL VI. Protoplasa. 



( Second submarginal cell much shorter than the first. 46 



4fi ( Three posterior cells ; Tab. II, fig. 20. Gen. XLV. Bittacomorpha. 



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



