234 [October, 



A SECOND AFRICAN SPECIRS OF PSYCHOPSIS: PS. MARSHALLI, 



McLach. 



by robert mclachlan, f.r.s., &c. 

 Pstchopsis Marshalli, 11. sp. 



£ . Body more or less fuscous in the dry insect (yellowish beneath), clothed 

 with long cinereous hairs mixed with blackish ; antennae brownish, usually nioi'e 

 yellowish towards the base ; head mixed with yellowish above, face yellow. Pro- 

 notum narrowed anteriorly, with four large yellow spots (of which the two hinder 

 are round and raised), and a yellow median line. Legs dingy yellowish ; tarsi 

 somewhat darker ; tibial spurs moderate. Abdomen sometimes yellowish above, 

 nioi'e so beneath : apical parts yellow, clothed with long concolorous hairs ; there is 

 a pair of large superior valves (or claspers), nearly contiguous at the base and 

 tbere somewhat swollen if viewed from above, convex externally and concave in- 

 ternally, the basal portion dilated but narrowing gradually to the semi-obtuse apex 

 which is incurved, on the lower edge is a dilatation or angulation which is often 

 brownish ; the infra-anal plate (or last ventral segment) is large and subquadrate, 

 slightly excised on its margin ; internally there are probably two plates, lying one 

 on the other, the upper longer and emarginate at its tip, and between them a 

 slender straight piceous spine (penis ?), but the definition is vague in dry examples. 



Wings whitish-grey : in the anterior pair are dark grey spots and irrorations, 

 the larger spots almost blackish and arranged somewliat vaguely in 3-5 oblique 

 fasciae ; the apical edge narrowly blackish (caused by the short eilisc), interrupted 

 with pale ; the membrane with slight pinkish iridescence (common to both pairs) ; 

 neuration mostly pale, with dark interruptions, the gradate nervules nearly blackish, 

 a space on each side of the ultra-median vague fascia wholly pale ; hairs of the 

 neuration long, blackish, and erect ; costal margin abruptly dilated at its base, the 

 costal area with a line of gradate nervules, which is nearer the costa at its com- 

 mencement, but gradually becomes nearer the subcosta, costal nervules simply 

 furcate (rarely ending in three branches) ; two series of discal gradate nervules, 

 viz., the 1st and 3rd. Posterior wings without markings and with pale neuration, 

 but the edge is blackish and interrupted as in the anterior, sometimes forming 

 vague indications of costal and apical spots : gradate nervules in costal area variable, 

 sometimes absent or limited to one or two basal cellules, sometimes extending half- 

 way above the subcosta, and sometimes practically to the junction of the subcosta 

 and radius ; two series of discal gradate nervules, the 1st and 3rd. 



Length of body, 10-13 mm. Expanse of wings, 33-39 mm.; length of 

 anterior wing, 16-19 mm. 



Rah. : Salisbury, Mashonaland (G. A. K. Marshall, No. 11), 

 January and February, 1900, 7 examples, all ^; my collection. 



I have much pleasure in naming this species after Mr. Guy A. 

 K. Marshall, F.E.S., who has done so much towards elucidating the 

 insect fauna of British Central South Africa, especially from a 

 philosophical standpoint, and to whom 1 am much indebted for a 

 fine collection of Neuroptera from that district. Ps. Marshalli in 



