NYSSON TRIMACULATUS. 99 



Nysson maculatus, Van d. Lind. Obs. ii. 31. 4. 



Dahlb. Hym. Europ. i. 170. 103. 

 Nysson omissus, Dahlb. Hym. Europ. i. 485. 3 ? 

 Nysson interruptus, Shuck. Foss. Hym. 101. 2. 



Dahlb. Hym. Europ. i. 170. 103. 



St. Farg. Hym. iii. 45. 1. 



Wesm. Hym. Foss. Belg. 80. 5. 



Female. Length 3^-4 lines. Black ; head very closely punc- 

 tured ; the clypeus with a silvery pubescence ; the antennae a 

 little longer than the head. Thorax closely punctured and 

 pubescent ; the collar and tubercles yellow, a small space at the 

 base of the metathorax regularly striate ; the tegulae testaceous ; 

 the wings fuscous, with their apical margins slightly clouded ; 

 legs ferruginous, with the coxae, trochanters, and femora, except 

 their apex, black ; the mesothorax silvery beneath. Abdomen 

 finely shagreened, the first two segments with deeper dispersed 

 punctures ; the apical margins of the three basal segments with 

 a yellow fascia, the first interrupted, the two latter attenuated 

 in the middle ; the first fascia sometimes entire. 



The Male only differs in having a dense silvery pubescence on 

 the clypeus and on the mesothorax beneath. 



This species is extremely local ; it is occasionally taken in the 

 London district, but I have not found it elsewhere : it occurs 

 occasionally with the former species in Bishop's Wood, Hamp- 

 stead, and also at Highgate. 



3. Nysson trimaculatus. 



N. ater ; abdomine utrinque maculis tribus flavis. 



Crabro trimaculatus, Rossi, Faun. Etrus. ii. 95. 892 <? . 

 Nysson trimaculatus, Fan d. Lind. Obs. ii. 30. 2 $ ? . 



Shuck. Foss. Hym. 102. 3. 



Dahlb. Hym. Europ. i. 169. 101. 



St. Farg. Hym. iii. 46. 2. 

 Nysson maculatus, Wesm. Hym. Foss. Belg. 78. 4 (var. ?). 



Female. Length 3J-4 lines. Black ; the head coarsely punc- 

 tured and slightly pubescent ; the antennae a little longer than 

 the head, the face with a little silvery pubescence, the tips of 

 the mandibles ferruginous. Thorax very coarsely punctured, 

 the punctures confluent ; the collar, tubercles, and a transverse 

 line at the base of the scutellum, yellow ; the base of the meta- 

 thorax with a few coarse longitudinal striae ; the sides of the 

 metathorax, as far as the lateral spines, covered with silvery 

 pubescence ; wings hyaline, their apical margins clouded ; the 

 knees and the apex of the tibire and tips of the joints of the 



