na 4 THE UNIVERSITY SCIENCE BULLETIN. 
rected downward (really three segments). The tarsi are all 1-segmented 
and end in two claws. The tarsi of the hind legs are fringed with hairs. 
The middle femora are furnished on their caudo-ventral margins with 
two strong bristles set upon elevations. 
Second Instar. 
The presence of the tuft and fringe of hairs on the ventral abdominal 
carina is the chief addition over that of the previous stage. The rear 
margins of the middle femora are now equipped with three strong bristles 
and there is a suggestion of the tooth or spine that becomes prominent 
in the succeeding instar. Antennze 3-segmented. First segment short, 
dise-like, second somewhat globose and third elongate. 
Third Instar. 
The caudal margin of the mesothoracic femur now carries a well- 
developed tooth as well as the three stout spines noted in the second 
instar. Tibia and tarsus of hind leg now fringed with hairs—wing- 
pads as in figure 4, plate XX. 
Fourth Instar. 
The middle femora now bear very stout processes in the line of the 
caudal row of spines. A series of short processes on the ventral side 
of this segment take the place of minute rugosities of the previous instar. 
Fifth Instar. 
The tooth or strong spine on the mesothoracic tibia is now extremely 
wide at its base. The limbs are stouter than previously and the wing- — 
pads now have the position shown in figure 4 of plate XX. 
In the table below the measurements are in millimeters and based 
on reared material. The adults are certainly smaller than those taken 
in Ithaca, N. Y., though practically the same as specimens from nature 
in Kansas. These figures are intended to help in determining an instar. 
The series measured is not large enough for purposes of generalization. — 
TABLE OF MEASUREMENTS. 
GENERAL MEASUREMENTS. Hixp Lea. Mippte Lrg. Fore Lee. 
et Sree ase! Iie sf (2h tase | s = s Zz S Sale 
= = Sue Do aa a . BD a! s a 4 B na 
: : 5 oe 3 ‘ 5 
; aie : : : 
Ist iting ©. e2e1 25 L062). 88a] 243 818 687 707 875; .437]..437) .313] .37 375) .275 
2d imstar: .2. o}h el 1.41 | 1.06 395 73 975 975] 1.12 | .63 | .625) .437) .5 53 37 
3d instar.....| 4.66°] 2. 1.4 A 566. | 0.472 |( SEAT Jl 53e lt de .65 | .75 | .762] .57 
4th instar....| 6.125) 2.75 | 1.87 53 .66 | 2.125) 2. ou \, 38 /1.37 | .93 | 1. Ll 2a to 
Sthinstar. .| 8.5 Su) 20) 66 .582| 3.1 2:89) | 2.75 12° 1. 2 1.16 |1.5. 41-58 |T12 
6th (male)....}11.4 | 4 2.86 4 or: et Zt 3.48 | 2.86 }2.68 12.57 |1.43 |1.94 |2.28 11.26 
6th (female). {11.4 4.28 | 2.97 42 .41 | 4.28 | 3.54 | 2.97 2.85 ‘2.68 |1.66 '2. 2.28 1.48 
General Notes on Development. There are certain constants of struc- 4 
ture that are carried through all the nymphal instars. The mesothoracic 
a RAD? 
ee ee, ee ee 
