136 



INSECUTOR INSCITI/E MENSTRUUS 



Thorax without scales. Mesonotum, scutellum, and postnotum dull 

 brown, all with long erect hair ; prothoracic lobes, pleurae, and coxae very 

 pale. 



Abdomen dull brown, without scales, clothed with long recumbent 

 brown hairs, densest at the sides and beneath, somewhat raised toward the 

 tip of the body and concealing the terminal parts ; dorsally each segment 

 with tufts of long erect hairs, densest and coarsest on the second segment. 



Wings limpid, nearly colorless ; about three and one-half times as long 

 as wide (without including fringe) ; first vein ending in the costa before 

 the middle of the second marginal cell ; distance from the furcation of the 

 second vein to the furcation of its upper branch about half as long as the 

 uppermost branch. 



Halteres with large black knobs. 



Fig. I . — Phlebotomus atroclavatus Knab. Male genitalia. 



Legs slender, brownish, covered with scales, brownish on the basal 

 portions, but with a strong whitish luster on the outer part of the tibiae 

 and particularly on the tarsi. Proportions of tibia and tarsal joints of hind 

 legs: 36; 19, 10,6.5, 5, 3. 



Length: Body about 1.3 mm., wing 1.75 mm. 



Male : This sex differs in the usual sexual characters and the slightly 

 smaller size. The genitalia are similar to those of other American species 

 but differ in detcdis of proportion and shape of the parts. The outer joint 

 of the claspers is thickened to near the apical fourth and there are inserted 

 dorsally at this point two long and very stout bristles, one closely behind 

 the other ; the apical fourth is attenuated, thumb-like, and bears apically 

 a still longer curved bristle, but little shorter than the segment itself ; on 

 the inner surface of the joint, beyond the middle, there is another stout 

 bristle, in addition to the ordinary scattered hairs. The lower gonapo- 



