Jan., '08] ENTOMOLOGICAL NEWS. 5 



Notes on the Tipultd Genus Dicranomyia. 



R. W. Doane, Stanford University. 

 TABLE FOR THE DETERMINATION OF THE SPECIES.* 



(Based on Osten Sacken's table in Mon. N. A. Dip. Pt. 4.) 



i. Wings remarkably narrow, lanceolate longipennis Schum. 



Wings of the usual shape • 2. 



2. Tip of the auxiliary vein nearly opposite, or before, or only a short 



distance beyond the origin of the praefurca 3. 



Tip of the auxiliary vein a considerable distance beyond the origin 

 of the praefurca , 31. 



3. The whole antennae, or at least their basal joints pale . ..... 4. 



The whole antennae black or brown 13. 



4. Discal cell open 5. 



Discal cell closed 7. 



5. Thorax with a single brown stripe in the middle . . imniodesta O. S. 

 Thorax with three brown stripes 6. 



6. Tip of the auxiliary vein nearly opposite or only a little before the 



origin of the praefurca gladiator O. S. 



Tip of the auxiliary vein a considerable distance before the origin of 

 the praefurca cinerea Doane. 



7. Flagellum of the antennae not infuscated pudica O. S. 



Flagellum of the antennae more or less infuscated 8. 



8. Knob of the halteres infuscated 9. 



Knob of the halteres not infuscated 11. 



9. Subcostal cross-vein close to the tip of the auxiliary vein. 



citrina Doane. 

 Subcostal cross-vein some distance from the tip of the auxiliary cross- 

 vein 10. 



10. Halteres pale, knobs infuscated ; abdomen brownish yellow. 



isabellina Doane. 

 Halteres and abdomen infuscated diversa O. S. 



11. Brownish markings along some of the veins and in some of the cells. 



marmorata O. S. 

 Wings hyaline 12. 



12. Body yellowish fulva Doane. 



Body greenish viridicans n. sp. 



13. Discal cell (in normal specimens) open ; tip of the auxiliary vein con- 



siderably anterior to the origin of the praefurca ; the praefurca 

 is about equal in length to the distance between the origin of 

 the third vein and the small cross vein, or even shorter . . 14. 

 Discal cell closed ; tip of the auxiliary vein nearly opposite the origin 

 of the praefurca (or, when anterior or posterior, the distance is 

 small) ; praefurca distinctly longer than the distance between 

 the origin of the third vein and the small cross vein . . .18. 



* I have not seen D. chorea Meig. , and cannot from the description place it or D. venusta 

 Berg, in the table. The latter is closely related to D. simulans Walk and D. duplicata 

 Doane. 



