402 



Silaon similis n. sp. 



Length : 6.5 mm. ; wing 4 mm. 



Nervulus inserted distinctly beyond the basal (about the width of the 

 vein), first cubital cell receiving both recurrents. 



Black ; transverse spot on either side of collar, tubercles, narrow 

 apical line at apex of trochanters behind and spot on the middle of hind 

 tibiae behind yellowish-white ; calcaria whitish ; mandibles piceous at 

 apex; tegulae, tarsi, and margins of abdominal segments brownish; 

 wings subhyaline, nervures yellowish except costa and stigma, blackish. 



Appressed silvery pubescence very conspicuous on clypeus and face, 

 less so on cheeks, collar, mesopleura, sides of propodeum and base and 

 apex of tergites (interrupted medially), continued along the sides of 

 the abdomen. Middle tibiae with a few whitish spinules, sternites 2-5 

 with the usual erect whitish setae on the margins. 



Clypeus strongly carinate, the apical margin of the middle lobe 

 thickened and shining, subtruncate, a little rounded out ; eyes strongly 

 convergent above ; carina extending from the clypeus over the front, 

 not strong, connecting a little above tlie antennal sockets with an im- 

 pressed line which deepens into a shining fovea on the middle of the 

 front and is continued faintly to the anterior ocellus. Front rather 

 strongly, coarsely and closely punctured, becoming striate in the de- 

 pression in front of the large front ocellus, vertex longitudinally stri- 

 ate between the ocelli, smooth and shining obliquely in front of the 

 hind ocelli with a few fine punctures on the orbits there; the head be- 

 hind the ocelli and the occiput transversely striatopunctate ; ocelli in an 

 equilateral triangle, the hind ocelli a little nearer the eye-margin than to 

 each other and further than this from the occipital margin. 



Pronotum very short, a little notched in the middle, abruptly de- 

 clivous in a plane in front but not carinate. Mesonotum closely, coarse- 

 ly subconfluently punctured, the parapsidal and median lines indicated 

 but not impressed ; mesopleura without an impressed pit, more dis- 

 cretely punctured on its disk ; scutellum strongly discretely punctured 

 more sparsely on the disk ; metanotum very finely and closely punctured ; 

 propodeum with the basal area ill-defined, liarc, opaque, with a few 

 radiating wrinkles more distinct at base and an imperfect raised line, 

 the general surface subreticulate, with smooth shallow punctures in the 

 interspaces ; the basolateral areas with the surface concealed by pubes- 

 cence ; sides of propodeum glabrous shining, obliquely striolate. posterior 

 face transversely striate, the fovea rather shallow. 



Abdomen shining, the first tergite strongly finely rather deeply punc- 

 tate, the others more finely and less distinctly so ; sternites similar. 



Closely related to S. plenoculoides (Fox) Liit the iniddlo 

 til)iae liave some spinnles, and the details of the head and pro- 

 podeal soulplnre seem different. Rohwer describes the pro- 



