98 E. T. CRESSON. 



H. insidiosus. — %. Head, thorax, posterior coxse, and first abdominal seg- 

 ment except tip, black; faee, anterior orbits, clypeus, mouth, lower part of 

 cheeks, scape beneath, collar, hook-shaped line on each side of mesothorax an- 

 teriorly, tegulae, spot before and another beneath, scutellums, most of pleura 

 beneath, four anterior legs, tips of posterior coxae, and their trochanters, bright 

 lemon-yellow; antennae rather longer than body, slender, fulvous, dusky at 

 base above; metathorax rounded, almost smooth, finely pubescent ; wings ample, 

 hyaline, iridescent, areolet wanting ; legs slender, posterior femora, tibiae and 

 tarsi ferruginous; abdomen subpetiolated, clavate, tip of first, and the follow- 

 ing segments entirely, fulvo-ferruginous ■ first segment gradually dilated to 

 apex, stigmatic tubercles prominent, and placed midway between base and 

 apex. Length 3V lines. 



Jlah. — Massachusetts. (Ridings.) One 'J, specimen. 



M. scapularis. — %. Black, subpubesoent, shining ; face, clypeus, spot beneath 

 each eye, mandibles except tips, and palpi, yellow; antennae as long as the 

 body, slender throughout, brown, paler beneath, scape yellow beneath ; meso- 

 thorax tinged with reddish, central longitudinal lines well impressed, on each 

 side a broad sutural yellow line dilated anteriorly and extending poster.orly for 

 a short distance on the impressed lines; scutellum yellow; postscutellum fer- 

 ruginous; metathorax shining, ferruginous at base, with several longitudinal, 

 tolerably well-defined carinae, the dorsal ones close together and confluent pos- 

 teriorly; tegulae, a double spot beneath, and an irregular line on each side of 

 pleura beneath, just behind the anterior coxae, yellow ; wings hyaline, irides- 

 cent, areolet oblique, jjetiolated, second recurrent nervure straight; legs rather 

 slender, honey-yellow, two anterior pairs much jjaler, their coxae and trochan- 

 ters and also the posterior trochanters, pale yellow, tips of posterior tibiae, and 

 of all the tarsi, dusky; abdomen slender, subclavate, shining, rufous, most of 

 the first, sides of the second and the three apical segments more or less, black; 

 first segment with a stout flattened petiole, with the stigmatic tubercles promi- 

 nent and situated at about the middle ; venter mostly black. Length 4 lines. 



Hab. — Connecticut. (Coll. Mr. E. Norton.) One % specimen. 



M. honestus. — % J. Pale ferruginous, thinly pubescent; head brown-black, 

 face, clypeus, mandibles except tips, and palpi, pale yellow, the former tinged 

 laterally with fulvous in 9 > antennae as long as the body, slender, especially 

 at tips, blackish, with a more or less distinct yellowish annulus beyond the 

 middle, apex fulvous, scape ferruginous, paler beneath; sides of prothorax, 

 scutellar region and space beneath the wings, blackish; collar, scutellum, teg- 

 ulae and a spot before, pale yellow; metathorax perfectly smooth, polished, con- 

 vex and thinly pubescent; wings hyaline, iridescent, nervures and stigma 

 brown, areolet triangular, subpetiolated ; legs color of the body, the four anterior 

 coxae and trochanters, basal half of posterior tibiae and most of their tarsi, pale 

 yellow; apical half of posterior tibiae black; abdomen shining, subpetiolated, 

 clavate, subdepressed, entirely ferruginous, more slender in %; first segment 

 gradually dilated towards the tip, depressed, without distinct stigmatic tuber- 

 cles. Length 3i lines. 



Sab. — Connecticut; New Jersey. Two J , one 'J, , specimens. 



M. albifrons. — J ■ Differs from honestus only in being larger and more robust, 

 by the broader head, which is black, with the face, clypeus, mandibles except 

 tijJS, spot beneath eyes, space on each side of antennae, and the palpi, white; 



