190 CALIFORNIA ACADEMY OF SCIENCES. 



With respect to the number and disposition of the back 

 hairs, the two following species are to be referred to the 

 group : 



Lopothrichi Grassi and Rovelli. 

 Lepisma rubro-violacea n. sp. 



The head has the form of a hat. The body is elongate, 

 backwards gradually tapering. The labial palpi are 

 three-jointed. The maxillary palpi are Jive-jointed. The 

 antenncB are indistinctly annulated with reddish brown and 

 white. The tetson is subtriangular and furnished with 

 two chitinous hooks. The cerci are distinctly annulated 

 with brown and white. The head is yellowish white, and 

 in front regularly colored reddish violet. The thoracic 

 tergits are yellowish white. The abdominal tergits are 

 reddish violet. The cuticula is smooth, -with anchor-like 

 figures. The scales are brown. Length 10—12 mm. 



The head is formed rather like a round crown of a hat, 

 and, when deprived of scales, yellowish white. On the 

 anterior margin of the upper side there are to be observed 

 some reddish violet spots, regularly disposed, and with 

 outlines rather indistinct. Under the microscope these 

 spots closely appear to correspond to areas thickly strewed 

 with small papillary elevations. After being boiled in 

 caustic alkali, these elevations look like small rings. 

 Along the posterior margin of the head there is a brown- 

 ish black border, discernible by the eye. The antenncB, 

 grayish brown in color, are furnished with light rings, 

 extremely fine, which, towards the points of the organs, 

 become more and more separated from one another. Not 

 having at my disposal any individual with the antenna? 

 perfectly preserved, I cannot exactly determine their 

 length. Approximately, I consider them to be of the size 

 of the body. 



The maxillary palpi are five-jointed. The two inner 



