170 Annals Entomological Society of America [Vol. II, 



notum and two spots of the same color on either side, one before and 

 the other behind the suture ; wings with a slight smoky tinge but this 

 is so faint that they well may be called hyaline and there is no appar- 

 ent darkening at the apexes as in many species of the subfamily 

 Asilinae. Coxae silvery, extreme base of each tibia reddish, other- 

 wise legs black with black bristles; halteres pale throughout. Abdo- 

 men shining black above with narrow white bands in front of the incis- 

 ures; in the anterior border of each white band, there is on each side 

 two or more medium sized bristles, more prominent in the male than 

 in the female ; venter of the abdomen silverv and with a few white hairs. 

 Taken at Gualan, Guatemala, January 13th, and at Mazatanango, 

 Guatemala, February 3, 1905. 



EXPLANATION OF THE PLATES. 



Side view of the male genitalia of Asilus gracilis. 

 Side view of the female genitalia of A. gracilis. 

 Side view of thernale genitalia of A. lecythus. 

 Side view of the female genitalia of A. lecythus. 

 Side view of the male genitalia of A. tenebrosus. 

 Side view of the male genitalia of A. avidus. 

 Side view of the male genitalia of A. occidentalis. 

 Side view of the male genitalia of A. auricomus. 

 Dorsal view of the male genitalia of A. auricomus. 

 Side view of the male genitalia of A. piceus. 

 Dorsal view of the male genitalia of A. piceus. 

 Side view of the male genitalia of A. montanus. 

 Dorsal view of the male genitalia of A. montanus. 

 Side view of the male genitalia of A. albicomus. 

 Side view of the male genitalia of A. lepidus. 

 Dorsal view of the male genitalia of A. lepidus. 

 Side view of the male genitalia of A. willistoni. 

 Dorsal view of the male genitalia of A. willistoni. 

 Side view of the female genitalia of A. willistoni. 

 Side view of the female genitalia of A. rubicundus. 

 Side view of the male genitalia of A. rubicundus. 

 Side view of the male genitalia of A. angustipennis. 

 Dorsal view of the :nale genitalia of A. angustipennis. 

 Side view of the male genitalia of A. latipennis. 

 Dorsal view of the male genitalia of A. latipennis. 

 Side view of the male genitalia of A. afhnis. 

 Side view of the male genitalia of A. flavofemoratus. 

 Side view of the male genitalia of A. orphne. 

 Side view of the male genitalia of A. coquillettii. 

 Side view of the male genitalia of A. terminalis. 

 Side view, of the male genitalia of A. brevicomus. 

 Side view of the male genitalia of A. johnsoni. 

 Side view of the female genitalia of A. johnsoni. 

 Side view of the male genitalia of A. erythocnemius. 

 Side view of the male genitalia of A. astutus. 

 Side view of the male genitalia of A. californicus. 

 Side view of the male genitalia of A. nitidifacies. 

 Dorsal view of the female genitalia of A. nitidifacies. 

 Side view of the male genitalia of A. arizonensis. 

 Dorsal view of the male genitalia of A. arizonensis. 

 Side view of the female genitalia of A. arizonensis. 

 Side view of the male genitalia of A. truquii. 

 Dorsal view of the male genitalia of A. truquii. 



