JOURNAL OF ENTOMOLOGY AND ZOOLOGY ae 
of each of the five species studied. The cerari are numbered from 
the head caudad. The measurements given do not include the 
base of the conical sete. The diameter being taken just above 
the collar-like base and the length being taken from the base to 
the apex of the sete. 
Citri Risso—(Figs. 10-11, Table I). An examination of Table 
I shows that the number of conical sete is two for each cerari 
and that this number is constant in all the specimens tabulated. 
Fig. 10 shows a camera lucida drawing of the first cerari. It 
will be seen from this figure that the number of wax pores 
is very few compared to the head cerari of some of the other 
species. This small number of wax pores is a constant specific 
character. In a large number of species examined the arrange- 
ment of the wax pores and sete varies but slightly from the 
figure. Cerari 2-16 resemble very closely this figure. The 
conical sete of the first cerari are 17-19 microns long and 4.2-4.8 
microns in diameter. Fig. I] shows the anal cerari. The bases 
of the conical sete are one-third larger than those of the head 
cerari. There are but few pores as in the first cerari. The 
two conical sete of each cerari are subequal in size. Two 
smaller sete are seen near the cerari. The conical sete of the 
anal lobes are 21-24 microns long and 5-6 microns in diameter. 
Obscurus Essig—(Figs. 14-15, Table II). Fig. 14 shows the 
first cerari of this species. The conical sete are slightly larger 
than those of the preceding species. The wax pores are ar- 
ranged thickly. There are three conical sete in this cerari, a 
constant character. The number of conical sete in the second 
cerari varies from two to four; four is the usual number. The 
fourth and fifth cerari each have two conical sete. The sixth 
cerari has three conical sete. The cerari caudad of the sixth 
each have two conical sete. The conical sete of the first cerar? 
are 9-10 microns long and 3.5-4.2 microns broad. 
Fig. 15 shows the cerari of the anal lobes. The large number 
of wax pores is noticeable. The caudal conical sete of the cerari 
is noticably larger than the cephalic one. The length of the 
conical sete varies from 28-32 microns and the diameter 8-10 
microns. 
