March, 1906. i Shelford : Horn's Systematischer Index. 7 



est group of the Cicindelidae. This genus is the result of a great 

 amount of converging evolution, some forms having descended di- 

 rectly from the Protoeuryodidse, many others having come indirectly 

 as offspring of the Odontochilini, Dromicini and Theratidse (families 

 and subfamilies of the Cicindelcz in broad sense). 



In the Holarctic region there are two northern tribes and two 

 southern tribes of Cicindelcz concerning which the author presents the 

 following hypotheses : The northern tribes arose in now warmer Africa 

 during a cooler period ; later the group separated into two parts, the 

 smaller number moved southward to find a cooler climate and is now 

 represented by C. 4-guttataWdm. in South Africa; the greater num- 

 ber, however, moved northward and separated into two parts, one re- 

 maining in Eurasia and the other crossing over into North America. 

 The two southern tribes arose in tropical America and part moved 

 toward the south, possibly some representatives crossing over into the 

 Australian region, while an equally large number moved northward, 

 part remaining in the nearctic region and a part crossing over into 

 Eurasia. 



The Cicindela fauna of the Nearctic region is thus made up of : ( 1 ) 

 The northern tribe or purpurea-obscura (obsa/ra-modesta) group; 

 frons broad and depressed, pilosity of head and prothorax erect : rela- 

 tives, (a) the soluta-hybrida-campestris group in Eurasia, (/>) the 

 4-guttata group in South Africa. (2 ) The Southern tribe or cupra- 

 cens group ; frons narrow, not depressed, pilosity of head and protho- 

 rax decumbent; relatives (a) the nivea-ritsem.cz group in the Neotrop- 

 ical region, (b) possibly the helmsi-dunedensis-scztigera group in the 

 Australian region, and (c) the elegans-trisignata group in Eurasia. 

 (3) The forms that have migrated in from the Neotropical argentata 

 group; head bald, pronotum hairy on sides and disc; unipunctata 

 Fabr. , belfragei Salle, pilatei Guer. , cursitans Lee, and celeripes Lee, 

 forms not understood by a study of the species of the United States 

 alone, belong here. (4) Forms belonging to the indigenous Mexican 

 fauna; head bald, pronotum pilose at the sides only. Our common 

 sexguttaia belongs to this group. 



A similar analysis is made of the Cincindela fauna of each geo- 

 graphical region, the boundary countries of which (for this genus) are 

 especially named. Other genera apparently do not present faunistic 

 discontinuties and hence are not so treated. 



So much for our author's views. He has not (presumably on ac- 



