432 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Overall body length 27.0 mm. 



This species is very close to productilis, but both sexes can be 

 separated from productilis by the characters in the keys. Examina- 

 tion of additional males demonstrate the presence of small wartlike 

 elevations on the hind margins of the abdominal terga. It should be 

 added that the hind margins of the seventh and eighth sterna are 

 convex and with a small median semicircular concavity. All the type 

 material was collected from a very small extension of Sporobolus 

 virginicus growing in the shade of white mangrove and Australian 

 pine trees ; this place is probably covered with water during the rainy 

 season. 



Types: Allotype, female, from Mona Island, Puerto Rico, J. Mal- 

 donado-Capriles collector, April 20, 1954, USNM 63091. Paratypes, 

 five females, same data; two males, same data as allotype, one in 

 PW and other in author's collection. 



Ghilianella nanna, new species 



Figures 48, 71, 91, 111 



Female: Head and thorax dark brown; antenna and legs brownish. 

 Middle and hind femora with two incomplete yellowish preapical 

 bands. Connexivial margins with apical half to just before posterior 

 angle blackish; terga medianly much darker, with irregular pale 

 brownish spotting, median ridge pale brown. Abdomen below 

 blackish brown, slightly paler medianly. 



Body and legs with very scarce and short appressed pilosity. 



Head granulose; eyes small. Interantennal spine long, bent 

 downward. 



Thoracic segments granulate; lengths of segments: 2.0, 1.2, 0.7 mm. 

 Claws of foretarsi two, the inner short and appressed to base of outer. 

 First spine of forefemur at slightly over its own length from tip of 

 trochanter. Armature of forefemur with inner row consisting of fine 

 setae arising from wartlike bases. Basal half of forefemur gradually 

 thickening to first spine. 



Abdomen without bulbous swelling, parallel sided. Lateral margins 

 of fifth and sixth terga shallowly concave. Apical angles of terga 

 slightly produced; hind margins of terga without wartlike elevations. 

 Seventh tergum slightly shorter than sixth, broader than long, hind 

 margin concave at either side of short median projection (fig. 91). 

 Eighth tergum over twice as broad as long, with a short median ridge, 

 at either side of median ridge a narrow longitudinal depression not 

 reaching hind margin. Ninth tergum with a broad median elevation, 

 lateral margins raised (fig. 111). Hind margin of seventh sternum 

 with a short median projection; with a median broad depression on 

 apical half (figs. 48, 71). 



