1912.] NATURAL SCIENCES OF PHILADELPHIA. 187 



(Mogisoplistus barbouri Morse, synonym of Cryptoptilum antil- 

 larum Redtenbacher.) 



Cryptoptilum contectum n. sp. 

 Cryptoptilum tubulatum n. sp. 

 Cryptoptilum trigonipalpum n. sp. 

 Cycloptilum squamosum Scudder. 

 Cycloptilum, zebra (Rehn and Hebard). 

 Oligacanthopus prograptus n. sp. 

 Hoplosphyrum occidentale (Scudder). 

 Hoplosphyrum boreale (Scudder). 



The series examined numbers 763 specimens, generically distributed 

 as follows: Glaphyropus 2, Cryptoptilum 475, Cycloptilum 236, 

 Oligacanthopus 1, Hoplosphyrum 49. The great majority of these 

 specimens were taken by the authors on recent trips and are locat* < - 

 in the Hebard Collection and that of The Academy of Natural Sciences 

 of Philadelphia, a considerable series, moreover, is in the Hebard 

 Collection ex Bruner, while important specimens were kindly loaned 

 to us by Dr. Samuel Henshaw, of the Museum of Comparative 

 Zoology at Cambridge, and through Mr. A. N. Caudell we have been 

 able to have before us the entire series of specimens belonging to the 

 United States National Museum. To these gentlemen, for their 

 many kindnesses, we wish to extend our hearty thanks. We would 

 also express our gratitude to Professor Albert P. Morse, Mr. William 

 T. Davis and Messrs. Sherman and Brimley for specimens of this 

 group which they have sent us for examination. 



Group MOGOPLISTII. 



Group Characters. — Size of all forms small; body covered with 

 translucent scales; apterous or having in the male sex abbreviate 

 membranous tegmina. Head discoidal, depressed, having an 

 interantennal protuberance which is separated from the vertex by a 

 transverse sulcus; ocelli very small or absent; palpi variable in 

 length. Pronotum in males often produced, vaulted or depressed; 

 lateral lobes of pronotum very narrow. Tegmina when present 

 containing all essential parts of tambourine. Caudal femora moder- 

 ately or considerably inflated; caudal tibiae serrulate on dorsa: 

 margins, without true spines, armed distad with six spurs; caudal 

 metatarsi armed distad with two arcuate spurs; all of the interna: 

 spurs being longer than their external equivalents. 



Key to the Genera of the Group. 



A. Dorsum of metatarsus almost unarmed, 19 Glaphyropus n. gen. 



(Genotype G. americajius.) 



19 In this division chaetiform spines are apparent on the margins of the meta- 

 tarsus when the latter is examined under a Zeiss binocular. 



