434 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Overall body length 21.0 mm. 



In the key this species is close to panamana, but they can be easily 

 separated by the mentioned characters. 



Type: Holotype, female, Hamburg Farm, Costa Rica, March 1936, 

 collector unknown, MCZ 29464. 



Ghilianella panamana, new species 



Figures 52, 92, 120 



Female: Head and thorax reddish brown. Antenna brown, third 

 and fourth segments each with apical two-thirds with whitish hairs. 

 Forelegs brownish, upper side of femur yellowish brown. Middle 

 and hind femora brown, each with three narrow incomplete annuli 

 on apical half. Middle and hind tibiae brown, middle tibia with a 

 basal yellowish annulus. 



Body covered with short, appressed yellowish pilosity. 



Head granulose ; eyes moderately small ; two short elevations behind 

 interocular sulcus. Interantennal spine long, curved downward. 

 Fourth antennal segment slightly over one and one-half times as long 

 as third. 



Thoracic segments moderately granulose; lengths of segments: 3.4, 

 4.5, 2.4 mm. Mesothorax with two small round elevations near pos- 

 terior margin. Claws of foretarsi two, the inner short and appressed to 

 base of outer. First spine of forefemur at nearly three times its length 

 from tip of trochanter. Basal half of forefemur gradually thickened 

 to first spine. Armature of forefemur with inner row consisting of 

 short and long spines alternating and between them longer fine setae. 



Abdomen widening to middle of fourth segment and thence parallel 

 sided to fifth, sixth widening toward apex, and seventh slightly nar- 

 rower apically; the widening of sixth segment not enough to form a 

 bulbous swelling. Hind margins of second to fourth terga straight, 

 with inconspicuous wartlike median elevations; lateral angles of terga 

 not produced. Fifth tergum longer than sixth, with sides slightly 

 concave, apical margin with small shallow concavity on connexivium. 

 Sixth tergum slightly less than twice as long as wide at base; postero- 

 lateral angles produced, hind margin with a large conical median 

 elevation. Seventh tergum shorter than sixth, slightly narrower api- 

 cally than basally, basal margin with broad median elevation set 

 against conical elevation of sixth ; hind margin concave and declivate, 

 with small median projection, shorter than projections of lateral angles 

 (fig. 92). Eighth tergum narrow, leaving exposed narrow portions of 

 ninth tergum at either side, depressed along median line, with fine 

 transverse corrugations. Ninth tergum with broad longitudinal 

 elevation on apical half; with a few transverse corrugations on basal 

 half; apex narrow (fig. 120). Second to sixth sterna shallowly concave. 



