es = 
iy 
E 
, 
148 THE UNIVERSITY SCIENCE BULLETIN. 
Structural Peculiarities. Wing pads now reach a trifle beyond the 
metathorax. The antenne more like those of the adult. There is still 
but one segment to the tarsi which become 2-segmented in adult. 
TABLE OF MEASUREMENTS IN MM. OF INSTARS OF B. FLUMENIA. 
| > | | | 
= Bopy Wrotss. | Hryp Lec. | Mippte Lec. | Fore Lec. 
=i eas ait Ses = ral vee aces are se 
Bere S| beat ies a2) 2 ee | Pe 1 
; ee by sh = eae g ana ete new (ht fue) = 
= | = 122 =) 2 = 
iessl Loewe 3 = he 
| es 4 . | | 
cae) 2 | het 
=a S | f } | | } 
Ist instar. . - 4.6 | 1.4 | were TE Fh 5) ie 8 |1.38]1.2 | 55) 1.4} 1.25 
| | | i | 
2d instar... 5.5 | 1.66|.....,] 2.-| 2.45] 1.5 22] 21 1. Its |1.6| .75| 1.75 1.5 
7 
3d instar..... ae Reg ee $.6| 3.4] .1,75] 2.9} 2:7) 1.4 42.5.2 | 9 oe eae 
4th instar....| 11.5 | 3 1.47| 4 6.2| 2.35] 3.95] 3.5] 1 73\3 5 |2.75]1.25] 3 2.5 
| | | 
5th instar. -..|°17_." | 3275)" 1-75) 5195] 9. ge) eee | 5.5 | 2.5 |5. |3.75)1.75| 3.5] 3.4 
| | | 
Summary. This common water bug is found in the trash of stagnant 
waters where it preys upon other aquatic animals. They winter as adults 
in the mud or trash of the pool. In the spring they mate and the female 
places from 65 to 158 eggs upon the back of the male, which is forced 
thus to carry them for a week or two till the young come forth. Six or 
seven weeks are required to complete a generation. 
Genus LETHOCERUS. Mayr. 1852. 
Most of the biological notes in the literature which deal with these 
insects are given under the generic names of Belostoma or Amorgius, 
Belostoma americana being a favorite. There are five species belonging 
to North America north of Mexico. L. americanus Leidy, L. obscurus 
Duf., angustipes Mayr, L. uhleri Montd, and L. annulipes H. S. Of these 
L. annulipes and L. angustipes are listed as western. The others general. | 
No complete life history has been recorded for any of these giant water 
bugs. The notes that hava been made concerning these large bugs are 
sometimes difficult to assign to this genus without the possibility that the 
observer was watching Benacus. : 
Habitat. Uhler says americanus lives in quiet, fresh or brackish | 
waters. It prefers larger bodies of water however than the little Belo- 
stoma, which may be found in very restricted pools. 
Hibernation. We are indebted to L. O. Howard, 1900, for the record ; 
that L. americanus winters as an adult. It was found in water under the 
ice. The temperature of the water was 10° F. The adult Belostomatid 
was taken alive by H. J. Giddings, of Sabula, Iowa, in February. 
Oviposition. ._In 1876, Dr. Riley read a paper before the American 
Association for the Advancement of Science, “On the Curious Eggmass 
of Corydalus cornutus (Linn) and on the eggs which have hitherto been 
referred to that species.” ‘In this he surmised,” says Weed, “that the 
