COLOR PLATE III. 



SEMIAQUATICS. 



Fig. 1. Hehrus concinnus Uhl. A tiny bug dwelling on the shore and 

 plant rafts. (Family Hebridae.) Magnification, 12i%7 times. 



Fig. 2. Hydrometra martini Kirk. An exceedingly slender little bug 

 living upon plant rafts. Called a "marsh treader." (Family Hydro- 

 metridse, formerly Limnobatidae.) Magnification, 3% times. 



Fig. 3. Rhagovelia obesa Uhl. A dweller upon the fast running wa- 

 ters. (Family Veliidae.) Magnification, 7%o times. 



Fig. 4. Trepobates pictus H. S. A beautiful surface strider. (Family 

 Gerridae.) Magnification, 1%-, times. 



Fig. 5. Gerris marginatus Say. Our common water strider. Mag- 

 nification, 3% times. 



Fig. 6. Mesovelia mulsanti White. A small bug about the size of a 

 chinch bug living in the same haunts as Hydrometra. (Family Meso- 

 veliidae.) Magnification, 7%5 times. 



Fig. 7. Microvelia borealis Bueno. A tiny little bug found upon the 

 water and about the banks of pools. This specimen is wingless, but many 

 are winged. Magnification, 12i7i7 times. 



Fig. 8. Gelastocoris, species new'i The toad bug at home on the 

 sandy shores of our streams (whether this bug is G. oculatus, variegatus 

 or another is still in doubt. Some will say it is variegatus, being too well 

 marked for oculatus.) Magnification, 3%7 times. 



Fig. 9. Ochterus americanii(i,\Jh\. A shore bug intermediate between 

 the toad bug and the Saldid shown in figure 10. The antennae are inter- 

 mediate in length between the long antennae of the Soldidae and the short 

 antennae of the toad bug. True aquatics have hidden antennae. The 

 toad bug has no objection to a swim in the water. The series from semi- 

 aquatic to true aquatic is shown by a study of figures 10, 9 and 8 of 

 this plate and figure 8 of color plate IL Magnification, 6%- times. 



Fig. 10. Pentacora signoreti Guer. (Specimen determined in Snow 

 collections.) Magnification, 6%- times. 



