On new Genera and Sj^ecies of Coleoptera. 25 



Summary. 



In the Polyzoon MicroporeJla ciUata^ Pallas, the foUowui^ 

 forms of the avicularian organ occur : — 



1. Ordinary avicularium with pointed bpak. 



2. Avicularium with the mandible elongated into a spine. 



3. Avicularium with the spinous mandible supporting a 

 membranous flapper. 



4. Vibraculoid structure with tall, well-developed seta and 

 partially-modified beak. 



IV. — Notes on Coleoptera^ wi'fh Descriptions oj" new Genera and 

 /Specie**.— Part IV. By Francis P. Pascoe, F.L.S. &c. 



Most of the species described below have been in my collec- 

 tion for many years. Haag-llutenberg and Mr. F. Bates 

 have during the time published many genera and species of 

 Tenebrionido3 ; but as the former is no longer amongst us 

 and the latter has given up the study, I have resumed the 

 task of making known some of the many unpublished forms 

 in my possession ; and to them I have added a few from other 

 groups. Drs. Horn and Leconte have given us excellent 

 accounts of the United-States species ; but they sternly refuse 

 to look at any other forms than their own. Dr. Horn finds fault 

 with some of us for not studying the American species : but we 

 cannot procure them ; collections from the United States 

 rarely or never come into the market ; and American entomo- 

 logists do not seem to care for any thing outside the States. 



In this and former papers I have designedly avoided all 

 recondite characters ; they are often only to be obtained by 

 dissection, involving perhaps the destruction of the specimen; 

 and too often, to avoid this, characters which are found in one 

 are assumed to exist in their near allies. To give a ready 

 clue to the name of the species is, I consider, the great object 

 of descriptions. 



List of Genera and Species. 



COLYDIID.E. AXTIIRIBID/E. 



Gempylodes superaus. Doticus (>;. [/.) paliuari.s. 



TENEBRIONID^. 

 EUCNEMID^. 0PATR1N.E. 



Hylotastes terininatus. Apostetlius («. ff.) terrenus. 



* For Part III., s-e 'Annals/ 1875, xv. p. 59. 



