310 T. D. A. COCKERELL. 



Of the Heteroptera, 28 are boreal or widely distributed, 13 West- 

 ern, and two Southern. Conorhinus (species not identified) is a 

 Southern type. For the rest, see the information given in the list. 

 The fauna, as a whole, is decidedly boreal. 



COMPARISON WITH THE HIGH-ALPINE ZONE. 



The high-alpine zone in Custer County extends from 10,000 feet 

 on the Sangre de Cristo range to the summits of the mountains 

 (Gibb's Peak, wrongly called Gibson Peak, 13,729 feet; Horn's 

 Peak, 13,447 feet ; Humboldt Peak, 14,041 feet, etc.). A list of the 

 high-alpine species, so far as observed, is given in " Can. Ent." 1890. 

 Although the number of records is not great, they show that the 

 high-alpine and mid-alpine zones are sufficiently distinct. 



Of high-alpine Hymenoptera, 49 species were identified, and the 

 result of comparing these with the mid-alpine is as follows : Out of 

 14 high-alpine families, two (Sapygid^e and Oryssidse) were not found 

 in the mid-alpine zone. One subfamily, Perilampin^e, is not mid- 

 alpine. Of 42 genera, 16 (rather less than one-third) are not mid- 

 alpine. These are Oryssus, Macrophya, Diaeretus, Sapyga, Perilmnpm, 

 Aspilota, Apludkis, Sphecodes, Dollchopselephus, Pteromalus, Atrac- 

 todes, Leptacis, Psilophrys, Callio])sis, Tenthredo and Microhracon. 

 Out of 49 species, 25 are not mid-alpine — about one-half. 



Of the high-alpine Coleoptera, 25 species are recorded, and a 26th 

 may be added, namely, Coceinella trifasciata L., from near the Mi- 

 cawber Mine in October. It extends to Canada, Lapland, etc. Of 

 these 26, seven genera are not raid-alpine, namely, Orsodachna, Di- 

 chelonycha, Chrysobothris, Zeugophora, Athous, Dasytes and Glyptina. 

 Eleven of the species are wanting in the mid-alpine collections. 



Of the Lepidoptera ("Can. Ent." 1890, pp. 57, 76) nine species 

 are not mid-alpine. To these may be added an insect doubtfully 

 referred to Choreutus dlphiella Grt., from the Micawber Mine : this 

 represents a family not mid-alpine. Lord Walsingham has the 

 specimen. 



These statistics would undoubtedly be altered by further research, 

 but I do not tliink they can be without significance. That the high- 

 alpine and mid-alpine fauna are largely of different derivation seems 

 to be proved by the large proportion of generic diflTerence. Thus, 

 25 distinct species of Hymenoptera include no less than 16 genera; 

 and eleven Coleoptera include eight genera. The high-alpine, there- 

 fore, is not, as regards its peculiar features, derived from the mid- 



