582 WEST AFRICAN INSECTA AND ARACHNIDA RILEY. 



Family FORFICULID.l^]. 



Sphingolabris sp. 1 

 Five specimons, Confjfo. 



Labidura riparia Palis. 

 Que specinioii, Congo, December 25, 1889. 



Order NEUROPTERA. 



Family HEMEROBIID.F. 



Subfamily Myrmeleonid^. 



A large Myrmeleonid (undetermined) having a wing expanse of 100 

 millimeters and a length of 40 millimeters, was (^►llected at Congo, De- 

 cember 28. The thorax and head are black, the legs brown, and the 

 abdominal joints brown, tipped with black. 



Order PSEUDONEUROPTERA. 

 By P. P. Calvkf^t. 



Family LIBELLULTD^E fsens. lot. J. 



Subfamily LibellultnvE. 



Diplax dilatata n. sp. Calvert. (Figs. 1 and 2.) 

 ^ . Vertex hairy, brownish or brownish yellow above, blackish in front and on 

 the sides; tip truncated, it>s outline very slightly concave from side to side. 



Frons hairy, brownish yellow or reddish, grooved above, with a 

 rather wide blackish band in front of eyes and vertex ; in front with 

 two small dark spots. Nasus and rliiiiarium brownish yellow, rhiua- 

 rium sometimes darker, i^abriim reddish yellow with some obscure 

 blackish marks. Labium black ; its lobes brown, blackish on the inner 

 and anterior margins and at Joint with labium (at this Joint sometimes 

 yellow). Basal Joint yellow. Occiput brown. Rear of eyes dark 

 brown with three yellowish spots, a row of light-colored hairs from 

 the right uppermost spot to the left one. 



Prothorax blackish, anterior margin yellow; posterior lobe with a 

 reddish tinge (dark red in life?), hind margin broad, bilobed, with a 

 Fiu 1. fringe of long light-colored hairs. 



Ab(loineii <>• Ui- Thorax l)n)wuish yellow, hairy; median doisal ridge blackish, reach- 

 plax dilatata .< ^ j ■> r- 



f/ n. sp. ing downwards to the front margin, which is also black, a brown 

 humeral stripe, first and second lateral sutures each with a black stripe, a short, 

 broader black stripe in front of the spiracle. The stripes on the sides reach down 

 to black spots around the feet. Pectus mostly blackish. 



Feet moderately long, black, femora .sometimes brownish interiorly, posterior 

 tibiie with two rows of 10 to 12 spines ; tarsal nails toothed before apex. 



Abdomen compressed at the base, liecoming narrower to the base of the lifth seg- 

 ment, Avhence it Avidens and thickens to the seventh segment, where it is wider than 

 at the base; from the seventh .segment it narrows to the apex, which is a little wider 

 than at the base of the tifth segment; the dilated portion at seventh segment tri- 

 angular in cross section. Color, brownish yellow, some ])arts with a reddish tinge 

 (red in life ?) ; segment 1 dark brown at base ; 2 sometimes with a small median dorsal 



