Fig. 12.—Odontopsyllus multispinosus, giant eastern rabbit flea, adult female. The absence of toothlike spines below 
the eyes and the presence of two rows of setae (instead of one row) on each abdominal tergite are features that distinguish 
this species from Cediopsylla simplex. 
and emerged as an adult 2 months later, September 7. 
The reared adult was determined positively as buccata. 
Cuterebra cuniculi (Clark) and Cuterebra horripilum 
Clark. — In the collection of the Illinois Natural His- 
tory Survey, there are six other specimens of bot flies; 
they were taken from Illinois rabbits in summer, 1883- 
1917. Some of these larvae are much larger in size 
than those found in Lee County and are presumably not 
Cuterebra buccata. Those that were reared to the adult 
stage were determined by the late C. T. Greene as 
cuniculi, a characteristically larger fly than buccata. 
According to our records, the pupa of cuniculi, unlike 
the pupa ofbuccata, spends about 10 months in the soil, 
One larva taken in Urbana on July 22, 1890, emerged as 
an adult on May 22, 1891. Another larva collected from 
the same locality on August 4, 1890, emerged May 19, 
1891. Several of the specimens of cuniculi from central 
Illinois were from the neck region of cottontails. 
One of the large unidentified bot fly larvae taken 
in Lee County may be cuniculi or the closely allied 
species, horripilum, rather than buccata. 
CHIGGERS 
Euschongastia peromysci (Ewing); Trombicula 
(Eutrombicula) alfreddugesi (Oudemans); Trombicula 
(Neotrombicula) whartoni (Ewing). — Chiggers infest a 
wide variety of mammal and bird hosts. On rabbits they 
are most commonly attached to the inside of the ears. 
[hey occur frequently on cottontails in central and 
southern [llinois, but apparently rarely in the northern 
part of the state. Where found in [llinois, Trombicula 
(Neotrombicula) 
whartoni late 
autumn and winter, Euschéngastia peromysci in late 
infests cottontails in 
winter, and Trombicula (Eutrombicula) alfreddugesi in 
late spring and summer. 
