1 10 INSECUTOR INSCITLt MENSTRUUS 



Frons slightly less than one-third the width of head ; two orbital bristles 

 below level of anterior ocellus, the upper one backwardly directed, the 

 lower directed forward ; anterior to these bristles there are only weak 

 orbital hairs ; central stripe with two rows of hears which increase in 

 length toward the front ; antennae normal ; arista bare ; basal joints swollen 

 slightly ; second joint elongated, length of entire aurista equal to length of 

 frons; cheeks linear, bristles carried well up toward base of the antennae;* 

 proboscis not elongated. Mesonotum covered with very short hairs on 

 disk ; two dorso-centrals present ; the peiir of bristles between the posterior 

 pair subequal with these ; stemo-pleura with 3 bristles ( 1 - 1 - 1 ) ; disk of 

 scutellum bare. Abdomen with segments 2 and 5 distinctly longer than 

 3 «uid 4, which are subequal, segment 5 longer than 2. Legs normal. 

 Wings with veins 3-4 convergent, the apex of 3 bent down ; outer cross 

 vein at about its own length from end of fifth. Length, 2 mm. 



Type: Cat. No. 15956, U. S. Nat. Mus. 



Locality : Island of Guam, Ladrone Islands (D. T. FuUoway) 7 spec- 



A NEW HETEROSTYLUM FROM MEXICO 



{Diptera, Bombyliida) 

 By FREDERICK KNAB 



Heterostylum stigmatias, new species. 



Male : Eyes broadly subcontiguous. Antennae dark, the first joint 

 dark brownish with blackish brown hair, the third joint black. Frontal 

 triangle with a dense tuft of short black hair on anterior margin. Face 

 clothed with pale yellowish brown hair, beneath with nearly white hair, 

 some dark hairs above antennae. 



Mesonotum black, clothed with short and close dull brown pubescence 

 becoming pale yellowish brown at the sides. Scutellum dull ferruginous, 

 clothed with pubescence similar to that on mesonotum. Pleurae clothed 

 with dense, long, dull creamy pubescence. 



Abdomen broad, short, and blunt ; vestiture of brown, blackish and 

 dull creamy yellow pubescence, the blackish hairs massed broadly upon 

 the dorsum, the brown more laterally, the creamy hairs at the apical 

 margins of the segments and most abundant laterally and on the apical 

 half ; vestiture of venter whitish with large patches of black hairs. 



