﻿It is now upwards of six years since I illustrated the genus 

 Pulex (vol. 3. ll*.), and by repeated examinations made bv 

 mv friends and myself, I lind it necessary to divide the Piilices 

 into two genera. I am the more desirous to publish this ge- 

 nus that the structure of the antennce may be made known to 

 the student, and consequently a better idea given him of the 

 affinities of this remarkable little Order. 



It is necessary to observe, that the P. TalpcpRguved in pi. lid-. 

 does not belong to the genus Pulex but to Ceratophyllus, and 

 my friend Mr. Ilaliday having discovered the antennae of 

 Pulex Canis, 1 have copied it from his drawing into the present 

 plate (fig. l.d.). As this discovery confirms the opinion of 

 Mons. Latreille, the 4<th paragraph on the second page of the 

 1 14th folio should be erased. jNIr. Haliday in his letter to 

 me observes, " In investigating the analogy between Cordijla 

 and Mijcctuphila nigra on the one hand and Pulex on the other, 

 I was led to the discovery of the antennic of the latter genus; 

 they are situate nearly as in Ccratophijllus, but entirely covered 

 by the frontal plate, are shorter than in it, very flat and 

 2-jointed ; the first joint has a bristle near its internal apex, 

 and the other is crowned with spines such as distinguish the 

 incisures of the trunk." 



I believe the following British species belong to my genus 

 Ceratophyllus. 



1. C. Talpse Curt. Brit. Knt. pi. 114. $ . 



Antennae elongate-ovate, pilose 10-jointed, basal joint ovate- 

 truncate, the remainder forming rings, (B. 1 c. front view of 

 head with the palpi and antennae, as well as one of the latter 

 detached and more magnified). 



Mr. C. A. Johnson gave me a specimen found on a Hat, 

 which appears to be the same as that from the Mole, and 

 from this animal I have a smaller species which seems to be 

 very different from C. Talpa. 



2. C. Miiris Curt. — Ofl' the Mouse. 



3. C. Mclis Lea.— Off the Badger. 



4. C. Sciurorum Olf. — Off the Squirrel. 



5. C. Erinacei Lea. — Off the Hedgehog. 



6. C. Lcporis Lea. — From tlie Hare. 



7. C. Colunibie Ste. — Off Pigeons. 



8. C. bifasciatus Curt. — Off a Sand-martin. 



9. C. Hirundinis Sam. — Fig. A. head in profile, with the antennae erect 



and the trophi separated. D. a maxilla and jmlpus. E. the man- 

 dibles, tongue, labium and palpi. 8 ? , the hind tibia and tarsus. 

 — On Swallows in June. 



10. C. Sturni Dale. — Curt. — Middle of May, on young Starlings. 



11. C. clongatus Curt. Brit. Knt. pi. 417- ? • fi'J- 1- b, an antenna. — Ort 



the Yellow Bat. 



12. C. Vesjiertilionis -Sow. — Found on Bats by Mr. Gray. 



13. C. fasciatus Lat. H. N. 14. 412.— Off the Rat. 



14. C. trifasciatus Curt. — Off a Bat, the smallest species I have seen. 



The Plant is Erigeron acre (Blue Fleabane). 



