82 Eev. T. A. Marshall's monograph of 



the five here introduced, all except the first are new 

 discoveries. Their earlier states have not yet been 

 observed. 



Table of Species. 



(2) 1. Prnsbrachial nervure of the fore wings obso- 



lete. Length, 1J lin. . . . . . . 1. vemalis, Wesm. 



(1) 2. Prasbrachial nervure of the fore wings dis- 

 tinct. Length, 1£ — 2 lin. 



(4) 3. First abdominal segment aciculated . . 2. splendidus, n. s. 



(3) 4. First abdominal segment smooth. 



(6) 5. Antenna; J 28-jointed (<J unknown), but 



its antennas cannot have fewer than 28 



joints .. .. .. .. .. 3. xanthoccphalus, n.s. 



(5) 6. Antennas $ 5 with fewer than 28 joints. 



(8) 7. Antennas $ J 19-jointed . . . . . . 4. tcstaceus, n. s. 



(7) 8. Antennas $ 26-, J 22— 23-jointed . . 5. cultus, n. s. 



1. Microctonus vemalis, Wesm. 



Microctonus vemalis, Wesm., Nouv. Mem. Ac. Brux., 

 1835, p. 56, pi. i. (wing) ; lib. cit., 1838, p. 142 

 (var. 2, <?); Euthe, Stett. Zeit., 1856, p. 289; 

 Eeinh., Berl. ent. Zeits., 1862, p. 322, $ ? . 



Perilitus idaluis, Hal., Ent. Mag., hi., 1835, p. 38, $ . 



Microctonus politus, Euthe, lib. cit., p. 290, $ . 



Testaceous, variable ; antennas after the 4th or 5th joint fuscous ; 

 head, thorax, and abdomen in various degrees infuscated or blackish 

 above ; apical joint of the tarsi and valves of the terebra fuscous. 

 Wings hyaline, nervures and stigma pale testaceous ; prasbrachial 

 nervure obsolete. Abdomen ? compressed; segment 1 scarcely 

 widened behind, sublinear, as long as 2, which is somewhat longer 

 than all the remaining segments together. Terebra as long as \ of 

 the abdomen. $ ? . Length, 1—1^ ; wings, 2— 2£ lin. 



Var. 1. Fusco-testaceous, the pleurae pale ; hind coxas infuscated. 

 $ (M. politus, Euthe). 



Var. (3. First abdominal segment black. $ . 



Var. 7. Thorax almost entirely black. $ (Wesm., Suppl., p. 142). 



Variable in colour, the $ darker than the ? ; the parts liable to 

 be infuscated are the vertex, stemmaticum, disk of the mesothorax 

 (in spots corresponding to the 3 lobes), scutellum, metathorax, and 

 abdomen above, especially at the apex. The smallest British 

 species. Eyes green. Antennas shorter than the body, filiform, 

 those of the $ 23—25-, of the $ 18— 21-jointed. Body smooth 

 and shining. Mesothoracic sutures effaced. Metathorax short, 



