282 MEDICAL ENTOMOLOGY 



Group VIII. 



39. Wings with first posterior cell closed or at least very much 



narrower at border. Forehead six to seven times as long as 



it is broad 40 



Wings with first posterior cell open, never very narrow at 



border 41 



40. Abdomen with three series of grey spots on abdomen, reddish 



brown in male, blackish in female amaenus. 



(China; Formosa; Japan.) 

 Abdomen with three grey spots on the first two or three 



segments only, a larger, broader bodied, blackish species . mandarinus. 



(China ; Formosa ; Japan.) 



41. Forehead narrow, six to ten times as long as it is wide 



anteriorly, with a long narrow frontal callus 42 



Forehead broader, four to five times as long as it is wide 

 anteriorly, with a larger nearly square, or pear-shaped 

 frontal callus .52 



42. Brown, reddish brown, or reddish yellow, medium sized or 



large species, the triangular greyish or yellowish spots not 



usually forming a continuous stripe ...... 43 



Large unicolourous reddish species with small median indis- 

 tinct white spots .......- 49 



Reddish brown or brown species with large prominent median 



whitish spots on the third and fourth segments only 50 



Reddish species with black spots .51 



Small species with a narrow yellow abdomen irregularly 

 marked with black and with three series irregular shaped 



grey median and lateral spots varicolor. 



(Borneo.) 



43. Medium sized species, 17 to 18 mm. in length. Abdomen 



reddish yellow with small median white spots. Forehead 

 almost parallel or barely a third narrower anteriorly, six 

 times as long as it is broad. Frontal callus oblong, not 

 reaching the eyes. Wings clear, faintly tinged yellowish 



brown rubicundus. 



(Assam.) 



Large brown or reddish brown species usually 18 to 25 mm. in 

 length with abdominal median spots. Forehead from one- 

 third to half narrower anteriorly, frontal callus long and 

 narrow ........... 44 



44. Forehead eight to nine times as long as it is broad, about 



one-third narrower anteriorly ......... 45 



Forehead very narrow, eight to ten times as long as it is 



broad, only half as wide anteriorly as at vertex 46 



45. Abdomen reddish, or reddish yellow, large, broad, with 



median short triangular yellow spots often indistinct. Fore 

 tibiae reddish yellow on ba.sarha.lf, with black pubescence. 

 Wings large, tinged yellowish brown or almost clear. Fore- 

 head almost parallel ........ stantoni. 



(Malay.) 



