1880.1] 395 [Patton. 
an impressed line which expands into a pit behind. The four im- 
pressed lines on the mesothorax anteriorly distinct, the lateral ones 
placed on elevations. Scutellum not distinctly impressed medially, 
extreme base of the metathorax with two or three transverse grooves, 
metathorax rounded, its upper face with a median groove, the 
groove delicately striate transversely in the middle, ending in a fovea 
posteriorly; posterior face of the metathorax medially impressed, 
the impression broader and deeper above. Spines of the anterior 
tarsi equalling the second joint of the tarsus in length, the first joint 
with six or seven spines externally, fourth joint of all the tarsi 
armed with slender spines, all the joints of the posterior tarsi armed 
both externally and internally, the spines within being longer than 
those without. New Haven, Ct., July 12th; Southington, Ct., July. 
3. Length 11 mm. The dorsal area silvery, defined posteriorly 
by the lateral truncations, the apex truncate. The eighth ventral 
segment broadly excavated at the apex so as to form two remote 
teeth. Joints 3-7 of the antenne crenulated beneath. The ante- 
rior margin of the clypeus slightly rounded out, entire, only the 
tooth at the extreme side being distinct. Labrum not seen. The 
median impression on the upper face of metathorax distinct only at 
the base and apex. All the tarsi, excepting the basal joint of the 
anterior pair, without armature, the spines probably being worn off. 
New Haven, Ct., July 12th, on the flowers of sumach (Rhus). 
Smaller male specimens, (which may be a seasonal-dimorph or 
belong to a distinct species) have the femora more broadly ferrugin- 
ous. The median tooth and the three lateral teeth of the 2 clypeus 
are present as rudiments, the labrum is like that of the 2, the groove 
on metathorax is distinct, and the tarsi are armed with spines 
arranged like those of the but more slender. Waterbury, Conn., 
Aug. 16th and 27th, on flowers of golden-rod (Solidago). 
The smaller size, the unimpressed scutellum and the presence of 
a fourth silvery band distinguishes the ? of this species from 7’. 
Crassus. 
TACHYTES HARPAX- 0. sp. 
2. Length 11-13 mm. Agrees with the description of mandibul- 
aris, in all but the following points. Dorsal area golden. The 
labrum, the middle and extreme apex of the mandibles, and the 
scape of the antennez beneath dark piceous. All the tibiae with a 
black stripe beneath. The three lateral teeth of the clypeus equally 
