374 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



In all scales examined the seventh, or usually the next to the last, 

 joint of citricola was shorter than the seventh, or last, joint of hes- 

 peridum. 



With two exceptions the fourth joint of citricola was shorter than 

 the fourth joint of hesperidum. 



Considering averages, in the majority of antennge examined the 

 third joint of citricola was shorter than the third joint of hesperidum. 



Considering averages, the fifth joint of citricola was longer than the 

 fifth joint of hesperidum. 



Although citricola, usually, has one more joint than hesperidum, 

 the total length of the antennse of hesperidum will average longer 

 than that of citricola. 



C. CITRICOLA 



Average length, in micrometer spaces, of antennal joints: 



12 3 4 5 6 7 8 Total 



10.0 9.05 11.88 9.80 9.73 7.56 7.43 13.14 78.59 



C. HESPERIDUM 



Average length, in micrometer spaces, of antennal joints: 

 12 3 4 5 6 7 8 Total 



10.2 9.94 15.92 16.82 6.60 7.18 16.43 — 83.09 



In hesperidum the numlier of hairs of the anal ring is usually giv^en as 

 eight. In the original description of citricola six was the number 

 stated for this species. Upon examination of the above characters, 

 the writer finds that there are six large and two small hairs on the 

 anal ring of both hesperidum and citricola. The two small hairs are 

 not readily seen without dissecting out the part and mounting so as 

 to show all the hairs in about the same plane. While, from the 

 observations of the writer, the number of hairs of the anal ring is 

 the same in both species in question, the difference in their length is 

 very marked, those of hesperidum being about one-fourth longer than 

 those of citricola. 



There appears to be no well marked distinctions between the motile 

 larvae of the two species. The antennse in this stage consist of six 

 joints. In citricola there is an indication of eight joints by a more or 

 less distinct separation of the fourth and fifth into two joints each. 

 In the second instar there are still but six joints although the cleavage 

 into two of the fourth and fifth joints is more pronounced than iuithe 

 larva. In the third instar the adult condition of eight joints is 

 acquired. In the case of hesperidum, the extra joint of the adult is 

 probably formed bj'' the fifth joint dividing into two. 



In general appearance citricola may be distinguished by the more 

 even distribution of the dark color pigment and the general ground 



