118 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Pronotum fulvous yellow, narrowly reddish brown on sides; reddish- 

 brown bands broader on mesonotum, and extending onto metanotum, 

 leaving a narrow yellowish line in middle; legs testaceous yellow, 

 distal end of hindtibia and femur slightly marked with brownish. 

 Abdomen brownish. 



Forewing 9.5 mm. in length, 4 mm. in width; membrane faintly 

 tinged with gray; venation largely testaceous and dotted with brown; 

 both inner and outer gradates fuscous black, slightly margined with 

 grayish; a conspicuous fuscous black spot over cross vein m-cu, and a 

 smaller one over first fork of Cui; a series of six small black spots on 

 radius at origin of M and of each branch of radial sector. Five 

 branches to radial sector, the last forked three times proximal to 

 outer gradates. First cross vein r-m vestigially short, just behind the 

 basal subcostal crossvein; M forked slightly before origin of first 

 branch of radial sector; Cu forked far out beyond the crossvein m-cu; 

 7 crossveins to inner and 10 to outer gradate series. 



Hindwing 9 mm. in length; membrane hyaline; veins mostly pale, 

 only four apical crossveins of outer gradate series, two discal cross- 

 veins, and first branch of Cui distinctly fuscous black. 



Male genitalia: Anal plate elongate, narrowed toward obtusely 

 rounded apex provided with a small spiny process arising from dorso- 

 internal margin and directed dorsointernally. Tenth sternite rela- 

 tively small with slightly expanded lateral "wing"; processes of 

 aedeagus very long, somewhat longer than parameres, directed pos- 

 teriorly and then strongly downward, and situated rather close together; 

 each aedeagal process very fine and almost uniformly slender for the 

 whole length. Parameres roundly dilated distally, each with a heavily 

 sclerotized apical border. 



This is an exceptional species on account of the great development 

 of the radial sector: not only are there five, instead of the usual 

 three, branches arising from radius, but the last branch is forked three 

 times before the outer gradates. This indicates that the increased 

 number of branches is real, not due to mere proximal displacement of 

 the branches usually present. 



Spinomegalomus^ new genus 



A peculiarity of this genus consists in the prolongation of the 

 seventh abdominal tergite in the male into a long dorsal process. 

 Genitalically, the anal plate is very long and narrow, contrasted to 

 the sub triangular form in Megalomus. In finer morphology of the 

 male genitalia, this genus differs from Megalomus by the epimeres 

 being fused onto the dorsolateral margin of the wings of the tenth 

 sternite, absence of phallobase, presence of hypomeres, and completely 

 fused parameres of peculiar structure. 



