COLOR PLATE III. 
SEMIAQUATICS. 
Fic. 1. Hebrus concinnus Uhl. A tiny bug dwelling on the shore and 
plant rafts. (Family Hebride.) Magnification, 12!%7 times. 
Fic. 2. Hydrometra martini Kirk. An exceedingly slender little bug 
living upon plant rafts. Called a “marsh treader.” (Family Hydro- 
metridz, formerly Limnobatide.) Magnification, 3% times. 
Fic. 8. Rhagovelia obesa Uhl. A dweller upon the fast running wa- 
ters. (Family Veliide.) Magnification, 7%; times. 
Fic. 4. Trepobates pictus H.S. A beautiful surface strider. (Family 
Gerride.) Magnification, 7%; times. 
Fig. 5. Gerris marginatus Say. Our common water strider. Mag- 
nification, 314 times. 
Fic. 6. Mesovelia mulsanti White. A small bug about the size of a 
chinch bug living in the same haunts as Hydrometra. (Family Meso- 
veliide.) Magnification, 7%; times. 
Fic. 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, 121547 times. 
Fic. 8. Gelastocoris, species new? 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, 3347 times. 
Fig. 9. Ochterus americanasUhl. A shore bug intermediate between 
the toad bug and the Saldid shown in figure 10. The antenne are inter- 
mediate in length between the long antennz of the Soldidze and the short 
antenne of the toad bug. True aquatics have hidden antenne. 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 II. Magnification, 6%7 times. 
Fic. 10. Pentacora signoreti Guer. (Specimen determined in Snow 
collections.) Magnification, 6947 times. 
