136 THE UNIVERSITY SCIENCE BULLETIN. 
they beat a hasty retreat; but if it quiets but for an instant, they are on 
it again, piercing it at the joints of the legs or in the sutures between the 
segments, until the victim of their voracity perishes, exhausted by its 
struggles and unable to overcome the actively poisonous saliva Microvelia 
injects. 
DESCRIPTION OF STAGES. 
The following are taken from Bueno’s paper: 
The Egg. 
“Size. Length, .6-.725 mm.; width, .25 mm. te .27 mm. 
“Shape. Ellipsoid. 
“Color. Translucent white, more or less glassy. The chorion sculp- 
tured in irregular hexagons.” 
First Instar. 
“Size. Length, .75 mm.; width, .42 mm., measured from living bug. 
Head, long.: lat. :: 15:22; eyes: vertex :: 6:10:6; antennal joints 1, 2, 
AO a Olsmemcmilios 
“Antenne 4-jointed, 1st curved and stout; 2d straight, a little stouter 
than the 1st; 3d slenderest; 4th slightly slenderer than the 2d, but as 
stout or a little stouter than the 1st, all thickly covered with long hairs, 
one long stout hair near the distal end of the 1st joint set in a sense pit 
and pointing outward; inserted under the head. Eyes exteriorly rounded, 
set obliquely in the head, occupying a little over one-half the head. Head 
thickly pilose. Rostrum 4-jointed, rising under the head. Proportions of 
joints: j1 : j2 : j8 : j4 :: 26: 7,: 60 ; 40. The second joint is annuli- 
form, and the 4th darker and apparently mere heavily chitinized than 
the others. The tylus is slightly prominent. In moulting, the lancets 
are cast with the skin. 
“Prothorax clearly indicated, ring-like; long.: lat.:: 5 : 25, in shape 
something like a curving collar of even width, sides rounded and sloping 
forward, thickly pilose. Prothorax and mesothorax fused into one, but 
an effaced suture visible between them; thickly pilose. 
“Legs: First pair shortest, 3d longest. All tarsi single-jointed, claws 
long, simple, slender, subapical, extending as far again from the tip of 
the tarsus as the tarsus projects beyond the insertion of the claw. Coxe 
and trochanters much elongated in the third pair. First tibie with two 
combs, second with one, apically situated; third tibia with a long, stout 
subapical spine. First pair of legs, femur longest, then the tibia, then 
the tarsus, which is stouter than the other two; second pair as the first; 
third pair, tibia longest, femur next and stoutest, then tarsus, which is 
more slender than either; all covered with long hairs. 
“Abdomen oval, segments well marked, genital segments prominent; 
all the segments dark, except at the connexivum, which is wholly light; 
eight apparent segments. The spiracles are seemingly not to be found 
in this instar, not being visible in either the entire nymph or in the cast 
skins mounted in balsam, even at a magnification of 530. This, of course, 
is not a proof that they do not exist, but rather shows how well they are 
concealed.” 
Second Instar. 
“Size. Length, .9 mm.; width, .55 mm.; balsam mount. 
“Proportions of head: long.: lat.:: 7 : 10 : eyes : vertex :: 14 : 32 : 14; 
antennal joints, 1 : 8 : 9 : 20; rostral joints, 9 : 3:13: 10. 
“The rostrum extends to the base of the prosternum, or to the inser- 
tion of the first pair of legs. 
> Prothorax, lat. : lone. syo0) 210. 
“First pair of legs stouter than the other two; the tarsal combs of the 
first and second pair as before; the third tibiz armed with a stout double- 
ee eT ee ee 
il it iti 8 
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