1903.] ' NATURAL SCIENCES OF PHILADELPHIA. 301 



Genus LABIDUEA Leach. 

 "1815. Lahidura Leach, Edinburgh Encyc, IX, p. 118." 

 Labidura bidens (Olivier). 



1791. Forficula bidem Ohvier, Encyc. Meth., Hist. Nat., VI, Pt. II, p. 466. 

 [Jamaica.] 

 Twelve specimens; six males, two females, four specimens damaged 

 and sex uncertain. 



Bermuda. [U. S. N. M.] (damaged). 



Cabanas, Cuba. June 2. (Palmer and Riley.) [U. S. N. M.] 

 Guanajay, Cuba. April 30. . (Palmer and Riley.) [U. S. N. M.] 

 ■ This name has recently^ been revived for the form occurring in the 

 West Indies, Mexico and Colombia. De Bormans and Krauss place 

 it as a synonym of pallipes Fabricius, but as Kirby says, the latter 

 name ''is usually apphed to the dark form of L. riparia; the types are 

 lost, and the insect cannot be identified till more specimens are received 

 from its locahty, the Cape Yerde Islands." 



The specimens from Bermuda are badly damaged, and are placed 

 under this name with some uncertainty. 



Genus PSALIS Serville. 

 1831. Psalis Serville, Ann. Sci. Xat., XXII, p. 34. Included P. americana 

 (Palisot) and P. morhida Serville. 



Psalis americana (Palisot). 



1817. For-ficula americana Palisot, Ins. Rec. en Afr. et Amer., p. 165, Orth., 

 t. 14, fig. 1. [San Domingo.] 



Ten specimens; nine males, one female; San Carlos, Costa Rica. 

 (Schild and Burgdorf.) [U. S. N. :\I.] 



This large and striking species has been recorded from locahties 

 extending from Chontales. Nicaragua, to western Colombia and Vene- 

 zuela, and also from Cuba and Haiti. 



In the mature specimens (6) in this series a shght variation is noticed 

 in the internal margins of the forceps. In four specimens these are 

 slightlv extended basally and distinctly crenulate. In two these 

 parts are straight and with the crenulations hardly visible. The im- 

 mature speciiuens (all males) are very interesting and might easily 

 be mistaken for members of the genus Anisolabis. Two stages, rather 

 different in general appearance, are represented in the series and are 

 worthy of separate description. 



One conclusion reached from a study of these specimens is, that the 

 immature forms possess lateral folds on the abdominal segments which 

 practically disappear by the time the ad ult stage is re ached. 



3 Ann. and Mag. Nat. Hist., 7th ser., XI, p. 66, January, 1903. 



