128 E. T. CRESSON. 



mesothorax, and a line at base of seutellum ending each side in a spot behind 

 tegulffi, of short dense appressed whitish pubescence; wings dusky at tips; legs 

 robust, clothed with short pale pubescence, tarsi beneath with dense yellow 

 pubescence, basal joint of two posterior pairs broad and flat; abdomen short 

 and broad, very finely punctured, sides of basal segment, and narrow apical 

 margin of segments 2 — 5 clothed with pale pubescence; apical segment covered 

 with a paleochraceous pile and with scattered short black pubescence; ventral 

 scopa yellow, the apical segment with black hairs. Length .40 inch. 



'^. Small, head unusually broad, the face and clypeus with long dense 



yellow pubescence, on the vertex it is long sparing and black, and on cheeks 

 white; antennae as long as head and thorax; pubescence of thorax white, 

 except on mesothorax and seutellum where it is black and long on the latter; 

 tegulse and legs brown, tarsi testaceous, anterior coxse each with a stout spine, 

 their tarsi simple, slender; abdomen quadrate, fifth segment flattened on each 

 side of disk, deeply margined at apex, covered with a pale pile and with 

 scattered black hairs; sixth densely pale golden yellow, the apex deeply 

 emarginate, the edge without serrations; venter brown, the segments narrowly 

 fringed at apex with white pubescence. Length .30 inch. 



Ilah. — Mexico, (Sumichrast). Sixteen specimens. 



Megachile zapoteca.— 9 .— Form rather broad, black, densely and 

 finely punctured, subopaque; sides of face, sides of clypeus, cheeks, thorax 

 behind, laterally and beneath, with long dense white pubescence, that on 

 vertex, mesothorax and seutellum long and black; disk of clypeus with very 

 short black pubescence; tegulae piceous; wings dusky at tips, with a brassy 

 reflection; legs with pale pubescence, that on tarsi golden-yellow; abdomen 

 shining, clothed with short black pubescence, that on basal segment long and 

 mixed pale and black, segments 2 — 5 with a narrow apical fringe of yellow 

 hairs; ventral scopa dense and yellow. Length .40 inch. 

 JIah. — Mexico, (Sumichrast). One specimen. 



Megacliile tuxtla. — %. — Robust, black, opaque; face and clypeus with 

 long dense yellow pubescence, on the vertex black, and on the cheeks white, 

 very dense and long beneath; antennae nearly as long as head and thorax; 

 thorax behind, laterally and beneath with long dense, pale ochraceous pubes- 

 cence, on mesothorax and seutellum it is long and mostly black; tegulse pubes- 

 cent; wings dusky at tips; legs slender, with pale pubescence, all the tarsi 

 slender; abdomen oblong-quadrate, first segment with long yellowish pubes- 

 cence, segments 2 — 4 narrowly fringed at apex with yellow, fifth segment large, 

 and with the sixth densely golden, clothed with sparse long black hair; apex 

 of sixth segment with two rather long acute teeth. Length .40 inch. 



]Jah. — Mexico, (Sumichrast). Three specimens. 



« 

 Megacliile tepaneca. — 9 • — Form broad, robust, black ; face with mixed 

 pale and black pubescence, that on cheeks entirely pale; middle of clypeus 

 and space above smooth, shining and flattened; flagellum rufo-testaceous be- 

 neath; thorax as sides and behind with dense fulvous pubescence, beneath 

 it is pale; mesothorax rather coarsely transversely sculptured, clothed with 

 sparse black hair, seutellum more finely sculptured, with scattered long black 

 hair; tegulae and four posterior femora fulvous, anterior legs, and rest of four 

 posterior legs brown, basal joint of posterior tarsi very broad, the intermediate 



