276 J. M. ALDRICH. 



live of Sarcionus. There is only one merabei" of the genus, and it 

 has large, elongated antennae, and the hypopygiuni is yellow. 



Pela!<itonenrus scutalus n. sp. 



Male.^Fuce: wide, in the middle with a shield-shaped brown spot, reaching 

 entirely across; below and above the pollen is of a whitish or glaucous color. 

 The point of the shield reaches to the lower edge of the face in the middle, and 

 there is a projection from the middle above also; so the white is divided into 

 four spots. Antennae blackish, with a trace of yellow at the bases of the joints ; 

 arista feathered with moderately long hairs. Front blackish, with a steel-blue 

 spot on each side; cilia of inferior orbit black. 



Thorax rather opaque brown, before the scutellum with a violet spot; tegulse 

 yellow, with black cilia; halteres with brownish knob; pleurae blackish, with 

 little dust. 



Abdomen quite uniform greenish brown in color; hypopygiura black, large, 

 the lamellfe smallish, rather narrow, black, with a few long black hairs on the 

 edge and some finer ones on the outer side. 



Legs in the described specimen with an immature appearance. The coxae and 

 femora distinctly black, the tibiae and tarsi brown. In a well-matured specimen 

 the tibiae would probably be pai'tly yellow. 



Wings uniformly infuscated, costa not thickened, cross-vein almost exactly at 

 right angles to the axis of the wing. 



Length 3 mm. 



One male, Biscayne Bay, Fla., collected by Mrs. Slosson. 



PelaNtoneurus parvus n. sp. 



Male. — Face wide, covered with bluish white dust; palpi yellowish ; antennae 

 yellow, the third joint large, a little longer than the others together, rounded at 

 tip, the apical half blackened ; arista jjlumose, with rather long hairs. Front 

 greenish brown, dull; cilia of inferior orbit black. 



Thorax rather dull green above, with distinct violet reflections near the scu- 

 tellum ; the sutural white spot large and distinct; usual black mark above the 

 wing also conspicuous; pleurae dark green, whitish-dusted; halteres and tegulae 

 yellow, cilia of the latter black. 



Abdomen green, only moderately bright; the first segment above distinctly 

 brighter than the rest in my specimen ; incisures with faint darker bands; hypo- 

 pygium ehjngated, rather slender, black, the lamellae dark brown, small and 

 rounded, with small black hairs on the margin, and still finer ones, mostly yel- 

 lowish, rather abundant on the outer surface. 



Fore coxae yellow, a little infuscated at base; middle and hind coxae with yel- 

 low tips; femora and tibise yellow; tarsi very slightly infuscated from the first 

 joint. 



Wings rather rounded, subhyaiine ; the fourth vein with bend in the middle 

 of its last section, approaching very close to the third, and ending considerably 

 before the apex. 



Length 3 mm. 



One male, Opelousas, La., from Dr. Hough. 



