290 



MEDICAL ENTOMOLOGY 



holoptic ; in others they are distinctly small and more or less 

 dichoptic. 



The species are abundant in the Ethiopian and Oriental regions, and in 

 North and South America. As a group they are retiring in their habits ; 

 they are found chiefly in well-wooded localities and in low lying shrub 

 in the vicinity of water. The females are blood-suckers, and feed upon 

 cattle and horses. 



Miss Ricardo gives the following Key to the Oriental species : 



3. 



5. 



KEY TO THE ORIENTAL SPECIES OF CHRYSOPS 



Wings with a dark transverse band and an apical spot 

 Wings with a dark transverse band but with no apical spot 

 Wings with a hyaline sinus on the posterior part of the band, 



in the fifth posterior cell ....... 



Wings with no hyaline sinus on the posterior part of the band, 



in the fifth posterior cell ....... 



Abdomen blackish, yellow at apex, with grey bands on the first 



two segments and a grey median stripe .... 



2 



1 1 



Abdomen yellowish with black stripes . . . , 



Abdomen black, whitish, or yellowish at base 



Discal cell hyaline. Abdomen with four long black stripes 



manilensis. 



(Manila.) 

 4 



. . 6 

 mlokosiewiczi. 



(China ; Japan.) 

 Discal cell not hyaline ........... 5 



Abdomen with a short black bifid stripe on the second segment, 



often extending to the third or fourth segment . . . dispar. 



(Widely distributed in India ; Ceylon; Malay and adjacent parts.) 

 Abdomen with a bifid stripe on the second segment and a 

 network of black markings on the third segment, leaving only 

 three yellow spots free ....... designata. 



(North India ; Western China.) 



6. Abdomen whitish on the first four segments, apex black . rufitarsus. 



Abdomen black, the first two segments largely yellow, the 

 second and third segments with small median spots. Face 

 yellowish. Apical border of band of wing straight, concave. 



Abdomen black, the second segment yellowish on fore border. 

 Face blackish. Apical border of band of wing straight 



Small species, abdomen blackish, the first two segments yellow 



anteriorly. Face black ....... alter. 



Large robust species. Abdomen blackish with paler median 

 spots, largely yellow on the basal segments. Face yellowish. 

 Apical border of wing irregular sinensis. 



(Java.) 



translucens. 



(Malay ; Java.) 



pellucida. 



(South India.) 



(Borneo.) 



(China. 



