508 PROCEEDINGS OF THE ACADEMY OF [Sept., 



lobes to the middle line beneath; the ventro-caudal edge of the 

 ninth tergite is concave and with an oval notch, the lobes thus 

 formed (see Plate XXI, fig. 83) directed entad, ventrad and slightly 

 caudad, heavily chitinized, minutely denticulate and provided with 

 a few long hairs. Ninth pleurite complete, rather large, subquadrate, 

 the dorso-caudal angle produced caudad and slightly dorsad and 

 entad; lobes two, flattened, fleshy, with numerous long hairs. Ninth 

 sternite rather restricted, the caudal margin beneath broadly con- 

 cave, the lateral lobes prominent, directed entad and caudad, the tips 

 expanded, truncate, the lobe with numerous long pale hairs on the 

 inner margin; immediately dorsad of this lobe is a small rounded 

 knob bearing numerous hairs; in a position of rest this knob is 

 invisible from beneath. Gonapophyses powerful (see Plate XXI, 

 fig. 82) directed caudad and slightly dorsad; they occupy the ventral 

 portion of the genital chamber, each one consisting of a cylindrical, 

 heavily chitinized horn, slightly divergent apically; a narrow line 

 of short strigose hairs on the outer face of each horn. Eighth sternite 

 large, the caudal margin truncated medially and here with a dense 

 brush of long pale hairs. 



The female is in the Loew collection and bears the label in Osten 

 Sacken's writing: authentic 9, caught with the cf, from Delaware. 

 The female is quite small, the wing measuring but 15 mm. The 

 abdomen of the allotype is broken off, but another specimen comes 

 close to bicornis in the very short valves to the ovipositor. 



Habitat. — Eastern United States. 



Holotype, cf, Oaklandon, Hancock Co., Ind., June 8, 1913 

 (Morrison). 



Allotype, 9 , Delaware. 



Paratypes, No. 1, 2 cf 's, Agricultural College, Lowndes Co., Miss., 

 April 9, 1908 (Kimbro) ; No. 3, d^ , Fort Washington, Prince George 

 Co., Md., May 26, 1896 (Johnson); No. 4, 5 d^'s, 19, District of 

 Columbia (Osten Sacken); No. 10, cf, Rhode Island (Johnson); 

 No. 11, c^, Shiloh, New Jersey, June 19, 1915 (Alexander); No. 12, 

 4 cT's, Four-mile Run, Fairfax Co., Va., May 31, 1914 (McAtee). 



Type and paratypes 1, 2 and 11 in the collection of the author; 

 allotype and paratypes 4 to 9 in the Museum of Comparative Zoology; 

 paratype 3 in the collection of Mr. Johnson; paratype 10 in the 

 collection of the Boston Society of Natural History; Nos. 12 to 15 

 in the collection of the Biological Survey. 



This interesting crane-fly is dedicated to my friend and companion, 

 Mr. Harold Morrison. 



