XXVI 
17. Gulde: “Die Dorsaldriisen der Larven der Hemiptera Heteroptera”, 
1902. Ber. Senck. Nat. Ges. Frankf. 85—136, Pl. 7—8. 
18. Kirkaldy: “Biological Notes on the Hemiptera of the Hawaiian 
Isles. No. 1”, 1907; P.. Baw. E. 8. 1 135—61. 
Contains a brief summary of Heteropterous biology, 
new classification etc. 
19. ide: “On the Phylogeny of the Hemiptera”, 1908, Canad. Ent. XL. 
357—64. (See also Entomologist 1898—1908 for numerous nomenclatorial 
papers.) 
Other papers, more limited in scope, will be found enumerated after 
the titles of families, subfamilies ete. 
Abbreviations. 
A. S. E. = Annales de la Société entomologique de. . 
Bo 5. E, == Bulletin’ (-. 502 <2 = eee ee 
A. M. N. H. = Annals and Magazine of Natural History (London). 
Pe, = Proceedings. 
Poe. eee = Sansa ons: 
0. V. A. F. = Ofversigt af Kongl. Vetenskaps- Akademiens Férhandlingar 
(Stockholm). 
Hiei onesie yet ae = paper not recently seen. 
Sirens oi. = paper containing biological notice, especially description of, 
or note on, nymphal or egg stage, anatomy, etc. 
Sa a escaee == paper containing figure of immature stage, anatomy, etc. 
a= adult; n= nymph; o = ovum. 
In concluding this Introduction to the first volume of my Catalogue, 
I have to thank very heartily my friend Mr. L. B. Prout, the well known 
Geometrologist and Nomenclatorialist, who has been unceasing in his kindness 
in looking up for me doubtful references and dates. Dr. E. EH. Bergroth 
has kindly furnished me with unpublished synonyms and much information. 
I have also to thank Mr. F. L. Dames for his care in seeing the final proof 
through the Press. 
Appendix to Introduction. 
In order to facilitate future researches in nomenclature and the checking 
of my results, I now give 1. a short summary of the earlier type-fixtures, 
which are those most in question, and 2. my reasons for citing certain 
types, in some genera, which are not apparent at first sight. 
a) Earlier type-fixtures 1), 
. In 1758 *), Linneus founded three Heteropterous genera, viz: Notonecta, 
Nepa and Cimer, without types. In 17613) Sulzer, im a general work, 
') | have dealt with these at length, from 1758—1843, in the « ist” 
AKT vas et eoan, ooev cea gth, , in the “Entomologist 
2 alae Naturae. Ed. 10. pp. 434—49. 
) Die Kennzeichen der Insekten, 98—102. Reuter (and I myself f 
; . ; ormerl 
denied type-authority to any works before 1794 (except, of course, =f the case " 
aude species), but I do not see that a line can be drawn. Sulzer’s is a general! 
Mt  @ summary of Linneus’ system, and where a single species is selected, | think’ 
it must serve as the type. If Sulzer is denied, because he sometimes selects more 
\ 
