Bugs, Cicadas, Aphids, and Scale-insects 
197 
true running. The water-striders are predaceous, capturing smaller living 
insects by running or leaping, and, with the prey held securely in the grasp- 
Fig. 269. Fig. 270. 
Fig. 269.—Water-strider, Hygrotrechus sp., adult. (Twice natural size.) 
Fig. 270.—Water-strider, Hygrotrechus sp., young. (Twice natural size,) 
ing fore legs, piercing and sucking the blood of the unfortunate victim, yet 
alive. Care should be taken in handling water-striders, as the sharp beak 
Stephania picta. (After 
Fig. 273. 
Uhler; natural 
size.) 
Fig. 272.—An ocean water-skater, Halobates ivullersdorffi, from near Galapagos Islands. 
(Three times natural size.) 
Fig. 273.—A marsh-treader, Limnobates lineata. (One and one-half times natural size.) 
can make a painful puncture. Some of them are winged and some wing¬ 
less, and both kinds of individuals may belong to the same species. The 
