200 [April 



tolerably well defined; tegulte yellowish-testaceous. Wings obscure 

 hyaline, faintly iridescent ; nervures fuscous, yellowish at base. Legs 

 pale ferruginous ; the eoxaj entirely, and the femora above more or less, 

 piceous. Abdomen depressed, subsessile, dark ferruginous, shining, 

 broadest behind the middle, and incurved at tip; basal segment black, 

 finely sculptured, broad at tip with a stout tubercle on each side about 

 the middle, and two well defined central longitudinal carinae. Length 

 21 lines; expanse of wings 4 lines. 

 One specimen. 



2. Stilpnus ? compressus. n. sp. 



Shining black ; tibiae and most of second and third abddminal segments, dull 

 ferruginous: wings hyaline, iridescent: abdomen elongate, compressed, slen- 

 der at base. 



Male. — Black, polished ; head trausverse. subcpuadrate, smooth, 

 slightly pubescent, more dense on the face, which is short; mandibles 

 rufo-piceous ; antenna; stout, as long as the head and thorax, slightly 

 involute, entirely black, and clothed with very short pale pubescence. 

 Thorax somewhat narrow, shining black, sparsely punctured, slightly 

 clothed with pale pubescence; the prothorax obliquely striated; scu- 

 telluin slightly prominent, rugose on the sides ; metathorax elongate, 

 rugose, the elevated lines well defined and longitudinal, forming a very 

 long and broad central area, which extends nearly the whole length of 

 the metathorax and somewhat depressed ; tegular piceous. Wings 

 rather ample, hyaline, beautifully iridescent ; nervures and stigma fus- 

 cous, yellow at base. Legs short, rather stout, blacky thinly clothed 

 with pale pubescence ; tips of the femora, and the tibiae entirely, ferru- 

 ginous; the anterior tarsi tinged with yellowish. Abdomen elongate, 

 black, highly polished, broad and compressed at tip ; basal segment 

 long, slender, subcylindrical, strongly arcuated and gradually swollen 

 towards the tip ; the incisure between the first and second segments 

 deep; most of the second and third segments stained with dull rufo- 

 ferruginous; remaining segments compressed ; venter much compressed 

 and edged like a knife towards the tip. Length o| lines; expanse of 

 wings 5 lines. 



One specimen. This singular insect seems to agree in every respect 

 with the genus in which I have placed it, except the shape of the ab- 

 domen which is entirely different from any other species of the genus 

 known to me. 



