527 



Palpi 4-jointed. Mesonotum and abdomen with sparse hairs. 

 Hypopygium as in Figure 12, Plate XL. Legs slender, mid and hind 

 pairs with moderately long hairs; fore tarsi with basal joint nearly 

 three fourths as long as fore tibiae (14: 20) ; hind tibia with two long 

 apical spurs; fourth joint of hind tarsus very slightly longer than 

 fifth ; tarsal claw long, curved, digitate apically ; empodium long, dis- 

 tinctly fringed. Third vein ending considerably in front of apex of 

 wing (PI. XXXIX, Fig. 5) ; second vein (Ro) indistinguishable. 



Length, 1.75-2-5 mm. 



Type locality, Muncie, 111., May 24, 1914; swept from vegetation 

 on bank of Stony Creek (C. A. Hart and J. R. Malloch). Paratypes 

 from Peoria, April 10, 1912, on a small creek; and from Havana, III, 

 April 22, 1898, at light, mouth of Spoon River (C. A. Hart). 



The absence of the second vein (Ro) distinguishes the species 

 readily from any other in the genus Orthodadius which I have seen. 

 It may not really be congeneric with the genotype oi Dactylocladhts; I 

 am unable to decide from the description given by Kieffer. The para- 

 types differ from the type in having the ground color of the thorax 

 fuscous. 



2. DaCTYLOCLADIUS PIvEURAUS, n. sp. 



Male. — Bright yellow, shining. Head yellow ; antennae and their 

 plumes entirely fuscous ; palpi yellow, apical half infuscated. Meso- 

 notum clear yellow, the vittae brownish black, shining, clearly defined, 

 no distinct division of the middle vitta; sternopleura black with the 

 exception of the upper posterior angle, and also a small black spot 

 slightly below and in front of wing-base ; scutellum clear yellow ; post- 

 notum black, slightly yellowish at base. Abdomen shining black, base 

 of first segment and hypopygium yellowish. Legs yellow, apices of 

 fore femora, the fore tibiae, and apices of tarsi slightly browned; mid 

 and hind tibiae with the normal apical black comb. Wings clear, veins 

 almost colorless. Halteres yellow. 



Pronotum extending almost to upper margin of mesonotum, with- 

 out a central excision. Mesonotum with but few weak hairs. Ab- 

 domen slender, segments of almost equal length throughout; hypo- 

 pygium as in Figure 13, Plate XXXVII. Legs slender; fore tarsus 

 without long hairs, basal joint slightly more than half as long as tibia 

 (20: 35) ; mid and hind legs with moderately long pale surface hairs 

 and distinct apical spurs. Cross vein slightly before middle of wing, 

 not upright ; cubitus forking distinctly beyond cross vein, the poste- 

 rior branch slightly curved; second vein (Ro) distinct. 



Length, 2.25 mm. 



