PLATE XXIII. 
OVIPOSITOR OF NOTONECT.Z, 
This plate contains three views of the left member of the-first pair 
of gonapophyses of the female of each of the species of the genus Noto- 
necta available in this country. Two species have been omitted because of 
the lack of material. ; 
The views are from left to right, outside or lateral view; ventral view 
showing the organ on edge, inner view. All of the drawings were made 
with camera lucida and drawn to the same scale. The length of the adult, 
together with outside measurements of the ovipositor, are added for 
purposes of comparison of relative size of parts. The writer believes that 
a study of these organs should be taken into account in determining rela- 
tionship of species. A study of a wide series would certainly establish 
the range of variability in size and shape of these parts, and in some 
cases, if not all, aid in specific determinations. The drawings here pre- 
sented are, however, intended to indicate merely the correlation of this 
organ with the habit of oviposition. 
Fic. 1. Notonecta lutea. Size of adult, 13-17.1 mm; valve of ovi- 
positor, 1.625 mm.x.725 mm. Specimen loaned by Mr. Gibson, of Nat. 
Mus. Taken in Finland by Sahlberg and determined by Kirkaldy. 
Fic. 2. Notonecta raleighwi. Size of adult, 9 mm.; valve of ovipositor, 
.4mm.x.25 mm. Specimen given to me by Mr. J. R. de la Torre Bueno. 
- Fig. 3. Notonecta undulata. Size of adult, 10-13 mm.; valve of ovi- 
positor, .5 mm.x.312 mm. Material from Ithaca, N. Y., and Lawrence, 
Kan. 
Fic. 4. Notonecta variabilis. Size of adult, 8.2-10.2 mm.; valve of ovi- 
positor, .4 x .312 mm. 
Fig. 5. Notonecta insulata. Size of adult, 12.6-15.5 mm.; valve of 
ovipositor, .7x .425 mm. Material from Palo Alto, Cal. 
Fic. 6. Notonecta glauca. Size of adult, ?; valve of ovipositor, 1.125 
x.55 mm. Loaned from Nat. Museum by Mr. Gibson; a specimen from 
England, collected by Uhler. 
Fig. 7. Notonecta Mexicana. Size of adult, 11-14 mm.; valve of ovi- 
positor, .7x.5 mm. Specimens from Arizona. 
Fig 8. Notonecta shooterti. Size of adult, 8-13 mm.; valve of ovi- 
positor, .65x.375 mm. Specimen given to me by Mr. J. R. de la Torre 
Bueno. 
Fic. 9. Notonecta irrorata. Size of adult, 11.8-14.4 mm.; valve of 
ovipositor, 1.675 x .575 mm. Material taken at Ithaca, N. Y. 
Fic. 10. Notonecta uhleri. Size of adult, 12 mm.; valve of ovipositor, 
.65 x .85 mm. Specimen given to me by Mr. de la Torre Bueno. 
Fic. 11. Notonecta indica. Size of adult, 10.5 mm.; valve of oviposi- 
tor, .5x.3875 mm. Material from Douglas, Ariz., collected by Doctor 
Snow. Plate first used in Ento. News, XXVI. 
(312) 
