1894 Insects. 



2. A. arcticus, Payk., Gyll., Steph. 



3. A. guttatus, Payk., Gyll., Steph., Aube. 



4. A. fontinalis, Steph. 111. 



— guttatus, var., Steph. Man. 



— vittiger, Steph., not Gyll., Aube. 



This species is distinguished from the preceding by its more elongated shape, and 

 especially by the upper claw of the anterior feet of the male, which has at its base a 

 strong tooth, while it is simple in H. guttatus. Perhaps this species is the A. bigut- 

 tatus, Oliv., Aube, but not finding that striking character mentioned in Aube's 

 description, and not being able to compare at present a foreign specimen, I must 

 leave this question undecided. 



5. A. chalconotus, Panz., 111., Gyll., Steph., Aube, &c. 



— cyaneus, Steph. 111., var. 



— montanus, Steph. 



— nigro-seneus, Marsh., Steph., not Erichs. 



— aterrimus, Steph. 



This species varies both in size and colour. The A. montanus, Steph., seems to 

 me to be only a small variety ; the A. nigro-seneus are immature specimens, and dis- 

 tinct from the species described under the same name by Erichson. 



6. A. affinis, Payk., Gyll., Steph., Sturm, Erichs., Aube. 

 Col. branchiatus, Babington, Steph. 



All the specimens which I have seen in different collections under the name of 

 Col. branchiatus, Babington, belong to this species. 



7. A. paludosus, Fabr., Gyll., Steph., &c. 



— striolatus, Steph., not Gyll. 



The A. striolatus, Steph., is an abnormal specimen of this species, and distinct 

 from A. striolatus, Gyll., Aube. 



8. A. congener, Payk., Gyll., Steph., Erichs., Aube. 



— confinis, Steph., not Gyll. 



9. A.femoralis, Payk., Gyll., Steph., Sturm, Erichs., Aube. 



— assimilis, Sturm, Aube. 



10. A. uliginosus, Payk., Gyll., Sturm, Erichs., Aube. 

 11.-4. abbreviatus, Fabr., Gyll., Steph., Aube, &c. 



12. A. maculalus, Linn., Fabr., Steph., Aube, &c. 



13. A. vitreus, Payk. 



— didymus, Oliv., Aube. • 



14. A. bipunctatus, Fabr., Gyll., Aube, &c. 



— nebulosus, Forst., Steph. 



15. A. conspersus, Marsh., Steph., Hornung. 



— subnebulosus, Steph., Aube. 



16. A. brunneus, Fabr., Aube, Steph. Man. 

 Dy. castaneus, Sch. 



Co. ferrugineus, Steph. 111. 



17. A. Sturmii, Schonh., Gyll., Steph., Aube, &c. 



18. A. bipustulatus, Linn., Fabr., Steph., Aube, &c. 



— carbonarius, Fabr., Gyll., Sturm, &c. 

 Var. Co. Snowdonius, Newm., Steph. 111. 



The Colymbetes consobrinus, Curtis, the type of which exists in the collection of 



