Famity—EVANIID. 125 
Species 7—TRIGONALYS PICTIFRONS. 
(Smith, Journ. Proc. Linn, Soc. Suppl. to vol. iv. 1860, p. 57-) 
Puate XXIII, Fic. 6. 
‘ Nitidus niger, distincte punctatus: capite pedibusque albo maculatis ; alis hyalinis apice fuscis, 
‘Male, length 3% lines, closely resembles the female, but rather more finely punctured ; the extreme base 
of the femora and apex of the trochanters are pale; there is also a pale spot on each side of the scutellum and 
of the postscutellum ; the second segment of the abdomen has an ovate spot on each side at its apical margin, 
and the third segment a very minute one beneath ; the apical margin of the second segment is produced into 
a stout obtuse flattened spine, directed backwards and meeting a porrected point on the following segment. 
‘Female, length 5 lines; black, head and thorax with coarse shallow confluent punctures ; the mesothorax 
with two oblique longitudinal impressed lines, which enclose, in the middle, one-third of the dise, the lateral 
portions being irregularly striated longitudinally ; the scutellum with a central depression; the metathorax 
rounded; the face with an ovate cream-white spot outside the insertion of each of the antennie, two at 
the base of the clypeus, and an oblong one at the inner margin of the mandibles; the head a little wider than 
the thorax; the tubercles, the anterior tibie in front, and the intermediate and posterior pairs at their base, 
white ; wings hyaline, iridescent, with a dark fuscous cloud at the apex, commencing at the stigma; abdomen 
shining, more finely punctured than the head and thorax; the base with a central longitudinal depression ; 
beneath more delicately and not quite so closely punctured.’ 
Habitat ; Makassar (Wallace), in Mus. W. W. Saunders ; Celebes (Wallace), in Mus. Britann. sub nomine 
Tr, luctuosa inseripta. 
The other species of the curious Genus Trigonalys are :— 
Species 8—TRIGONALYS MELANOLEUCA. 
(Westw. Proc. Zool. Soc. April 14, 1835, No. 28, p. 533 Trans. Ent. Soc. rst Ser. ili. 273; Celius Servillet, 
St. Fargeau, Guérin. Rev. Zool. 1842, p. 84; Westw. Trans. Ent. Soc. iii. p. 273.) 
Habitat ; Bahia, Brazil. 
Species 9—TRIGONALYS DEPRESSA. 
(De Geer, Mémoires, iii. pl. XXX, fig. 7; Westw. Trans. Ent. Soc. 2nd Ser. vol. i. p. 231.) 
I have examined De Geer’s typical specimen of this species in the Royal Museum of Stockholm. It is 
identical with a specimen in Paykull’s Collection in the Stockholm Museum which bears the MS. name of 
Sphex (?) nigrita. 
Habitat; Brazil, Surinam, Cayenne. 
Syn.: Zrigonalys obscura. Westw. olim Trans. Ent. Soc. vol. ii. p. 273. 
Trigonalys bipustulata. Smith, Ann. Nat, Hist. 2nd Ser. vii. p. 28. 
Trigonalys compressa. Smith, Trans. Ent. Soc. 2nd Ser. i. p. 178, pl. XVI, fig. 2. 
Seminota Leprieurii. Spinola, Guérin. Mag. de Zool. Ins. 1840, pl. XLI. 
We are indebted to Mr. Smith for a note on the habits of this species, In a nest of Polistes Lanio Fabr., 
from St. Salvador, in the British Museum, he found a specimen of the Trigonalys with its head protruding out 
of one of the cells. The parasite was not enveloped in any pellicle, nor had the cell been closed in any way ; 
the wings were crumpled up at the sides of the body, as is usual in Hymenopterous insects which have not 
expanded them, proving very satisfactorily that it had never quitted the cell, and that Trigonalys is the parasite 
of Polistes. ‘The discovery,’ Mr. Smith adds, ‘is one of much interest, proving the relationship of the insect 
to be amongst the Pupivora, to which family it had been previously assigned by Mr. Westwood.’ (Proc. 
Ent. Soe. April 7, 1851 ; and White, Appendix to Voyage of Rattlesnake, p. 389.) 
