1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



185 



Bristles. — Inner vertical and outer vertical of good size, inserted 

 as usual. Post vertical very small, inserted a little caudad the line 

 of the inner verticals. Occipito-central replaced by a number of 

 minute bristles. Cilia? of posterior orbit as usual, well aligned, 

 rather small. Greater ocellar very small, divergent, pointing almost 

 directly laterad. Lesser ocellar exceedingly minute, numerous, in 

 four to six rows, occupying nearly the whole of the ocellar promin- 

 ence and extending caudad to or nearly to the line of the inner ver- 

 ticals. Ascending frontal, one, parallel to the outer vertical, in- 

 serted on a level with the greater ocellar some distance laterad the 

 line of insertion of the transfrontals halfway between that line and 

 the lateral border of the geno-vertical plate. Transfrontals ten to 

 twelve, small, non deccusate. Orbitals two, very small (0.2 to 0.3 

 mm. long), curved laterad instead of ventrad as usual, inserted 



/v <OJ 



2/4 





Humeral, 3. Dorso-central, 5, 2 in front of and 3 behind the 

 suture. Intra-alar, 1. Supra-alar, 2. Acrostichal, 1, posterior. 

 Presutural, notopleural and postalar as usual. Scutellar : Apical, 

 four marginal and two discal as figured. 



about at the middle (dorso-ventrally) of the geno-vertical plate and 

 0.3 or 0.4 mm. (dorso-ventrally) from each other ; besides these two 

 orbitals the geno-vertical plate is quite thickly clothed with very 

 minute hairs or bristles which toward the vertex are black and 

 toward the gena? are whitish or colorless. Gense, clothed like the 

 geno-vertical plates with exceedingly delicate and minute whitish 

 hairs. Buccal clothed like the gen a?, but toward the occiput the 

 hairs are much longer than elsewhere (as much as 0.2 mm.). Vi- 

 brissal ridges almost straight, only very slightly convex laterad; 



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