PROC. ENT. SOC. WASH., VOL. 22, NO. 3, MAR,, IQ2O 51 



suggest the new name Micropteroclerus as a substitute for Microp- 

 terus Chevrolat (1842). 



Isolemidia substriata, new species. 



cf Elongate oblong, sides parallel, head across eyes as wide as elytra at 

 humeri, thorax quadrate, as long as broad, width of head: width of thorax:: 

 13:10. Color bluish black with a metallic luster, head and thorax with a 

 trace of greenish, apical and basal margins of thorax narrowly, legs, antennae, 

 mouth parts (except for mandibles) testaceous. Mandibles piceous. Head 

 vertical, eyes widely separated, space between eyes shallowly excavate, just 

 above clypeus transversely wrinkled, otherwise with longitudinal wrinkles, 

 these almost effaced in the median portion but more prominent near eyes. 

 Part of head back of eyes with fine grooves and ridges. Punctures coarse 

 but sparse, most abundant anterior to a line across the head at the middle of 

 the eyes. Punctures are continued backward from this space on two areas, 

 either side of a median smooth space on the vertex. Pubescence very sparse, 

 a mixture of black and pale vertical hairs. Antennae nearly reaching base 

 of thorax, eleven segmented, segments 9-11 forming a lax club, 9 and 10 

 globular, 11 somewhat longer and pointed, slightly sinuate on inner sides. 

 Thorax quadrate, smooth and polished though quite uneven, without distinct 

 punctures. Apical and basal transverse impressions present though not 

 deep. Sides gradually expanded just before the middle. On the disk, just 

 behind the apical transverse impression, there is a conspicuous pit which is 

 sharply delineated before and at the sides but posteriorly is continued in a 

 groove which constantly becomes more shallow and is finally effaced just 

 in front of the posterior transverse impression. Pubescence very sparse, of 

 erect pale hairs. Scutellum cordate, densely pubescent. Elytra long, en- 

 tire, completely covering the abdomen, slightly wider at apical fourth, suture 

 closed, extreme tips slightly rounded. Surface highly polished but more or 

 less irregular, the irregularities tending to form striae. Lateral margins 

 double for basal three-fourths. Pubescence more dense than on head or 

 thorax, erect, pale. Under parts black, polished, minutely punctulate, mod- 

 erately pubescent on the pleurae. Terminal dorsal segment of abdomen 

 broadly truncate at apex, and lateral angles of the truncature rounded, at 

 the middle very shallowly emarginate. Terminal ventral segment, deeply 

 and broadly emarginate, the only visible parts being two slender, lateral 

 horns or claspers. The penultimate ventral segment is also broadly but not 

 as deeply emarginate. Legs long and slender, posterior femora not equaling 

 tips of elytra. Tarsi normal, claws simple. 



9 Similar to the male in size, form and sculpture. The coloration of the 

 lytra differs in that they are brown with paler tips, with no trace of blue. 

 Both dorsal and ventral terminal segments are simple in outline, the ventral 

 having a longitudinal median impressed furrow. The legs are darker than 

 in the male. 



