with remarhs on some ctberrant genera of the Scoliidx. 65 



Thynnus luzonicus, n. sp. 



^. Antennae shorter than the thorax. Clypeus very prominent 

 and ahnost pointed at the base, deflexed to the apex and very broadly 

 truncate. Mandibles blunt at the apex, the tooth on the inner 

 margin very sliglitly developed. Head closely and rather finely 

 punctured, the interantennal prominence touching the base of the 

 clypeus ; the front with a median longitudinal sulca not quite reach- 

 ing the anterior ocellus. Thorax closely punctured, most finely on 

 the pronotum and on the sides of the mesonotum. Scutellum broadly 

 rounded posteriorly, with a slight subtuberculate prominence on tlie 

 middle of the apical margin ; the postscutellum covering the median 

 segment, which is vertically truncate. Abdomen shining, sparsely 

 but rather deeply punctured ; elongate conical, the first segment as 

 broad as the second and vertically truncate anteriorly ; the sixth 

 ventral segment with a spine on each side at the apical angles. The 

 dorsal plate of the epipygium is produced from the base, rounded at 

 the apex and longitudinally striated. Hypopygium with a stout 

 spine on each side near the basal angles, thence rather broadly pro- 

 duced and truncate at the apex with a broad apical spine ; obliquely 

 striated above. 



Black ; the clypeus, the mandibles except at the apex, the inner 

 orbits of the eyes, not reaching the summit, a narrow line behind 

 but not touching the eyes, two large spots between the antennae, a 

 small spot on each side on the vertex, the margins of the pronotum 

 narrowly, a spot on the mesopleurse below the anterior wings, 

 another above the base of the intermediate coxae, the tegulae, a short 

 oblique line behind them, a longitudinal line on each side on the 

 posterior half of the disc of the mesonotum, a broad transverse band 

 on the middle of the scutellum and a spot at each of its basal angles, 

 the postscutellum, the truncation of the median segment and a large 

 spot on the sides, a broadly interrupted transverse band near the 

 middle of the four basal abdominal segments, a spot on each side on 

 the fifth and sixth segments, a spot at the apex of the first ventral 

 segment and one on each side on segments 2-5, the anterior coxae 

 beneath, the apex of the intermediate and posterior coxai and the 

 femora beneath yellow. Tibiae and tarsi ferruginous. Wings 

 hyaline tinged with yellow, nervures black. 



Length 21 mm. 



Hah. Albay, S.E. Luzon {Whitehead expedition). 



Type in B. M. 



This is a true Thynnus of the typical group, and is 

 interesting as extending the range of the genus far beyond 

 the limits hitherto recorded. 



TRANS. ENT. SOC. LOND. 1908. — PART I. (MAY) 5 



