1931 ] Camponotus (Myrmepomis) sericeiventris 
95 
pronotuxn with short, very blunt spines, the meso- and 
metanotum less strongly compressed above, the petiole with 
blunt, broadly rounded superior border and more obtuse 
lateral angles, the flattened tibise somewhat broader. The 
appressed pubescence is coarser, longer and denser, deep 
golden yellow, feebly or indistinctly converging to the mid- 
dorsal line at the posterior borders of the gastric segments. 
Hairs abundant, on the head and thorax, black with deep 
fulvous tips, on the gaster fulvous throughout. Head and 
mandibles deep red, vertex blackish, sides, clypeus and gula 
shining and very finely punctate, the posterior corners with 
several short impressed line-like punctures. 
Workers major, media and minor. Length 8-12 mm. 
Resembling the maxima, except in having the head 
smaller and black throughout, the appressed pubescence, 
however, even more abundant, covering the thorax, coxse, 
petiole and posterior half of the head as well as the gaster. 
Pronotal spines short and blunt, petiole with obtuse su- 
perior border as in the maxima. 
Female (undescribed). Length 16-17 mm.; fore wing 15.5 
mm. 
Resembling the worker maxima, but head slightly longer 
than broad, subtrapezoidal, with rather straight sides and 
feebly excavated posterior border; the sides, clypeus and 
gula smooth and shining, deep red, as are also the mandi- 
bles. Pronotum with small blunt projections instead of the 
spines. Petiole shaped as in the maxima. Pubescence, es- 
pecially on the head and thorax somewhat shorter. Scutel- 
lum and anterior portion of mesonotum smooth and shin- 
ing, without pubescence. Wings colored as in the typical 
sericeiventris. 
Costa Rica: Pacuarito, type-locality (W. Paap). 
Guatemala: Champerico, Corinto and San Benito (R. 
Paessler) ; Retaluleu (Stoll) ; Patulul (Wheeler). 
Mexico: La Zacualpa, Chiapas (A. Petrunkevitch) . Santa 
Lucrezia, Vera Cruz (F. Knab) ; Cordova; Remutadero, 
Cameron and Mirador, Vera Cruz (E. Skwarra). 
