NATURAL HISTORY SOCIETY OF GLASGOW. 309 



punctured, black ; the face from below the antennae whitish- 

 testaceous ; orbits of the eyes slightly surrounded with testaceous. 

 Antennae bare, black, thin, decreasing very perceptibly in breadth 

 towards the apex ; the 3d joint apparently longer than the 4th ; 

 in length thej^ are decidedly longer than half of the body, if not 

 longer than the abdomen. Thorax black, shining; mesonotuni 

 very finely punctured, half shining ; cenchri scarcely visible ; 

 pronotum pale testaceous. Abdomen black, broader at the base 

 than the thorax ; the apex bluntly pointed, pilose ; saw scarcely 

 projecting; the external part surrounding it testaceous, and the 

 posterior part of the ventral surface of the same colour. Feet 

 white, with a testaceous tinge; femora marked Avith a broad 

 black line above, beneath with a black or fuscous line ; posterior 

 tarsi and apex of tibiae dark fuscous, almost black, the base of the 

 tarsi being palest ; posterior tarsi equal to, if not a little longer 

 than, the tibiae. Wings scarcely hyaline, having a fuscous yellowish 

 tinge, especially at the apex; costa and stigma testaceous; 1st 

 sub-marginal nervure very faint ; 2d recurrent nervure received 

 a little bit in front of the 2d sub-marginal ; 2d sub-costal cellule 

 with a dot in the centre ; 3d small, nearly square. 



The male is smaller, with the antennae slightly thicker; the 

 orbits of the eyes are broader marked with testaceous, and there 

 is a broad testaceous splash on the side of the breast; the anal 

 segment above, and the posterior half of the ventral surface 

 beneath, are of the same colour. Further, the posterior tibiae 

 have more than the apical half black ; the antennas are 

 quite black. 



I have noticed that in some specimens the legs are more 

 marked with black than in others, and some males want the 

 testaceous splash on the side of the thorax. 



I took about a dozen of this species on 17th May, on some 

 spruce trees growing in a wood by the side of the old road 

 between Milngavie and Strathblane. Subsequently I made 

 several efforts to discover the larva, but so far without success. 



When I first examined this insect, I put it clown as Nematus 

 ambiguus, Fallen = parvus, Hartig; but on a more minute exami- 

 nation, I have no hesitation in saying that it cannot be that 

 species; and in this opinion I am glad to have the concurrence of 

 Dr van VoUenhoven. Thomson (Hymen, Scand, i., 109), describes 

 the antennae of amhiguus as " dimidio corpore parum brevioribus;" 



VOL. II. V 



