212 PROCEEDINGS OF THE ACADEMY OP 



D. gladiator. Fusco-silacea, thorace vittis tribus fuscis, abdomine 

 fusco ; pedibus fuscis, femorum apice infuscato, alis hyalinis, stigmate in- 

 fuseato, areola discoidali aperta ; long. lin. 2\ 3. 



Proboscis pale ochraceous, palpi infuscated, antennae brown, pale at base. 

 Thorax brownish ochraceous, with three distinct brown stripes on the praescu- 

 tum ; the intermediate one extends over the coll are ; the lateral ones over the 

 scutum ; scutellum and metathorax brown in the middle ; pleurae with a large 

 brown spot near the intermediate coxae and several smaller, indistinct spots ; 

 halteres pale at base ; knob brown ; feet brown, coxae and base of femora pale; 

 tip of the latter brown, with a pale ring before it. Abdomen brown, posterior 

 margins of segments and genitals paler ; falciform appendages of the $ for- 

 ceps very large ; (fig. 5,) they are very striking in the living insect and when 

 their points touch each other, they form a kind of arch or bridge over both 

 lobes. (The name of the insect is derived from their sword-like appendages). 

 Wings slightly subcinereous ; stigma elliptical, more or less infuscated ; neura- 

 tion exactly like that ofD. immodesta. 



Fourteen $ $> specimens. Washington in June (nob.) 



If it was not for the structure of the ^ forceps and for the circumstance 

 that large numbers ofD. gladiator occur in localities where not a single 

 specimen of D. i m m o de s ta is to be found, and vice versa, I would have 

 taken the former species only for a darker variety of the latter. 



D. diversa. Pallide silacea ; antennarum flagello, halteribus, tarsorumque 

 apicibus fuscescentibus ; alis hyalinis, stigmate pallide infuscato ; venis fuscis; 

 long. lin. 2 2$. 



The abdomen is slightly infuscated, the genitals are yellow. Otherwise this 

 species is not unlike D. immodesta from which it is easily distinguished by 

 its smaller size, the presence of a discal areolet, the absence of the brown stripe 

 on the thorax, and the wings, which are purer hyaline. The mediastinal cross-vein 

 is, like in D. immodesta, at a distance from the tip of the mediastinal rein, 

 which is about equal to the length of the stigma. - 



Five $ and <j> specimens. 



Washington and Maryland in the Spring (nob.) 



D. p u d i c a . Pallide silacea tota ; oculis nigris, tarsorum apicibus fuscis ; 

 alis pallide flavescentibus, venis pallidis; long. lin. 3 3. 



There is not much to add to this diagnosis ; the stigma is scarcely apparent, 

 being of the same pale yellowish color as the rest of the wing ; the mediastinal 

 vein joins the costal a little before the petiole : the cross-vein is not far from it3 

 tip (at a distance shorter than half the length of the stigma.) 



Two (5* and four 5 specimens from Illinois, (Mr. Kennicott.) 



D. morio. Thorace nigro, nitido, pleuris argenteo-micantibus ; alis pallide 

 infuscatis, stigmate fusco ; long. lin. 3. 



Tipula morio Fab. Ent. Syst. iv. 242, 40 ; Syst. Ant. 32, 42. 



Limnobia leucocephala Meigen, Auss. Zw. i., 136, 37. 



Limnobia morio Meig., ibid. vi. 274 ; Walker Ins. Brit. Dipt. iii. 296, 32. 



Head black, front silvery ; antennae and palpi black ; last joint of the former 

 ending in a slender, cylindrical prolongation, which might be taken for a 15th 

 joint. (For this reason Meigen, vol. vi. p. 274, counted 15 joints in this spe- 

 cies.) Thorax black, shining on the praescutum, silvery on the pleura ; halteres 

 with a blackish knob ; feet pale brown, coxae pale. Abdomen brownish with 

 pale margins of the segments. Wings pale brownish, stigma darker brown. 



Eight tf 9 specimens from Trenton Falls (nob.) 



Although not having European specimens of this species for comparison, I 

 hardly doubt of their specific identity. 



[Aug. 



