Diptera 49 c 



Rhamphomyia sp. 



Two larvae of a species belonging to this genus are in the collection. 



length they are 13 mm., and in colour pure white, with the exception of 

 the cephalic parts which are black. The general structure of the .head is the 

 same as that of Rhamphomyia dimidiata Loew, a species I have figured and 

 described from Illinois.i 



• J'^^ raandibles are sharp and much curved, when fully protruded extend- 

 ing beyond apex of the sharply pointed labrum. The prothoracic spiracles are 

 small, rounded, and shghtly protruded. Apical segment of abdomen ending in 

 tour short, pointed processes, the two upper distinctly smaller than the two 

 lower; spiracles rather small, round, situated on the under side of base of upper 

 processes. No distinguishable hairs on body. 



Localities: Demarcation point, Alaska, in wet moss-pillow. May 20, 1914; 

 Bernard harbour. Northwest Territories, June 28, 1915 (F. Johansen). 



DOLICHOPODID^. 



The larvae of the doHchopodid genera in this collection are, as far as I 

 know, found in muddy streams or pools. The imagines are predaceous, those 

 of Hydrophorus and Scellus almost exclusively so, though Dolichopus is most 

 frequently found feeding upon the nectar or honeydew on plants. 



Dolichopus Latreille. 



There are only two specimens of this genus in the collection, one male 

 and one female, possibly representing only one species. 



Dolichopus dasyops, n. sp. 



Male. — Blue-black, with a distinct cupreous tinge. Antennae and arista 

 black; face black, with dense yellowish brown pile; palpi yellow; proboscis, 

 black; postocular cilia entirely black; hairs on eyes yellow. Dorsum of thorax 

 with coppery tinge; fringes of squamae black. Hypopygium black, lamellae 

 white, blackened on apical margins and with black hairs. Legs yellow, fore 

 coxae slightly infuscated at bases, mid and hind pairs black; apices of hind tibiae, 

 apices of basal three, and all of apical two, joints of fore tarsi, all but base of 

 mid tarsi, and entire hind tarsi fuscous. Wings clear, veins dark brown. 

 Halteres yellow. 



Eyes hairy; antennae not elongated, third joint pointed, shorter than high 

 (PL VII, fig. 8) ; arista with second joint much elongated, third densely pubescent; 

 face parallel-sided, about one-sixth the head-width at its middle, not descending 

 to lowest level of eyes. Scutellum with two strong bristles and two weak hairs. 

 Hypopygial lamella as in PI. V^, fig. 9. Fore coxae with short black hairs, 

 and a few long bristles near apex; fore tibia with three to four antero-dorsal, 

 two postero-dorsal, and three to four posterior bristles; fourth joint of fore 

 tarsi dilated from base to apex, fifth very much broadened, its width about 

 equal to its length; mid tibia with one ventral, two to three antero-ventral, 

 four to five antero-dorsal, and five to six posterior bristles; mid tarsi simple, 

 with a few short bristles on apical half of basal joint, one of which on dorsal 

 surface is conspicuous; hind femora with inconspicuous black hairs on apical 

 portion of postero-ventral surface; hind tibia with short regular hairs on basal 

 two-thirds of antero-ventral surface and one long bristle beyond these, antero- 

 and postero-dorsal surfaces each with about eight long bristles; postero-dorsal 

 surface with a slit at apex which runs forward on to dorsum; posterior surface 

 densely black setulose on apical half; basal joint of hind tarsus with about 



1 Bull. Ill, State Lab. Nat. Hist., vol.12, art. 3, p. 401, 1917. 



Vol. iii— 46963— 4 



