364 ON THE PEDIPALPI OF NORTH AMERICA. 



The; proximal end of the third joints is somewhat tumid, and has on its anterior face . 

 several tuberculoid spinules. The hands are but little larger than the preceding artic- 

 ulation. Their faintly pronounced crests are not crenulate. The movable finger is 

 somewhat longer than the fixed. The opposing surfaces are armed, with both 

 imbricated, obliquely longitudinal series of very minute tuberculoid teeth, and also a 

 row of larger ones on either side. The sides of the body are generally fuscous, but 

 in some specimens, perhaps from the action of alcohol, they are of a much lighter tint. 

 The legs are light yellow, strongly compressed, more or less tuberculate, and provided 

 with crenulate lines. The tail in both sexes is much longer than the body. The 

 superior surface, is broadly furrowed, but the penultimate segment, especially in the 

 male, often has the upper surface rounded, and the furrow obsolete. The four an- 

 terior caudal joints are protected on each side by superior, supero-lateral, infero-laterah 

 and inferior minutely crenulate crests. The first has in addition to these a median 

 lateral. The penultimate segment is much longer than either of the others, and has 

 two supero and infero-lateral, with a single median inferior ridge. But in addition to 

 these, it often has the rudiments of the median lateral and lateral inferior. The 

 number of teeth composing the comb varies in the normal adult from 21-25. Beau- 

 vois originally described it as possessing only eighteen. We have seen one or two 

 with that number, but think they are redeveloped appendages. Mr. Girard con- 

 sidered this species as the young of S. biaculeatus. Although this at the first glance 

 appears somewhat plausible, yet the examination of a large suite of specimens has 

 convinced us that he is mistaken. We have seen a number of immature individuals 

 of S. biaculeatus all of which possessed the essential characters of the adult. The 

 geographical range of this species is very great. From the Southern Atlantic States, 

 it extends through Texas along that curious well-known belt of almost tropical animal 

 life into Southern Kansas, and perhaps still farther north. 

 Length of body c? | una 9 una 1 tail c? una If ? una 1\. 



B. californicus. — B. dilute olivaceo-fulvus, fuseo vitatus; ceplialotlioraee antico late sed haud profunde 

 emarginato, medio valde canaliculate ; oculis lateralibus in serie recta positis ; palpis modice gra- 

 cilibus, marginibus distinctc crenulatis ; manibus niodiee tumidis ; digitis nonniliil elongatis et cur- 

 vatis; abdomine medio valde carinato, tuberculis parvis valde asperato; pedibus flavis, compressis, 

 proximis lineis elevatis vel crenulatis vel denticulatis impressis, ultimis pilosis ; pectinis dentibus 21 ; 

 cauda nonnibil elongata, leviter crenulata ; spiculo spinulo basali parvissimo armato. 



Scorpio (Atreus) californicus, Girard, Marcy's Report. 



In our single specimen the cephalothorax is yellow and immaculate, with the ex- 

 ception of the eye spot. It is, however, bordered with black. Anteriorly it is slightly 

 emarginate. The surface is very rough, with the lateral grooves indistinct, but is 

 furnished posteriorly with a curved series of tubercles on each side. Each abdominal 

 scutum, save the last, has a well-marked curved series of tubercles on each side. The 



