98 M. W. NIELSON 



dorsad ; dorsal appendage with prominent subbasal, lateral flange, ventral margin with several 

 sharp spines basally; ventral appendage very narrow, tube-like, with several sharp spines on 

 dorsal margin subbasally, apex reaching apex of dorsal appendage; gonopore terminal; 

 connective Y-shaped; style clawed apically; plate with distal segment elongate, somewhat 

 bulbous apically. 



Female seventh sternum with posterior margin produced medially. 



Distribution. Morotai, Solomon Islands. 



Specimens examined. 



Coelidia aurulenta Walker, holotype $, Moluccas: Morotai (Wallace) (BMNH, 

 London). 



Solomon Is.: North Georgia, Munda, 1-30 m, 1 $, 4 $, 20.vh.1959 (/. L. Gressitt), 5 km 

 S. Munda, 1 §, 19. xi. 1963 (/. L. Gressitt); Kolombangara, Kukundu, S.W. coast, 1-12 m, 3 §, 

 10.vii.1959 (/. L. Gressitt); Bougainville, Boku, 1 Q, 4— 6. vi. 1958 (/. L. Gressitt); Borioko, 

 300 m, 1 $, 6.VL1956 (/. L. Gressitt); N.W. Malaita, Dala, 2 $, 7^.1964 (R. Straatman); Santa 

 Ysabel, S.E. Tatamba, 0-50 m, 2 <£, 31.viii.1964 (R. Straatman); Gagan, 40 m, 1 <$, 8-n.xii.1959 

 (T. C. Maa); San Cristobal, Wairahu R., 100-400 m, 1 g, 9-15.V.1964 (/. Sedlacek); Buka 

 Agriculture Station, 1 £, 6-10. xii. 1959 (T. C. Maa); Choiseul I., Kolombangara R., 60m, 

 1 $, 23.vi.1964; Vella Lavella I., Ulo Crater, 10 m, 1 <$, 7.xii.i963 (P. Shanahan); Gingolo, 

 1 <$, 17.xi.1963 (/. L. Gressitt); Malaita, Auki, 2-20 m, 1 §, 2.x. 1957 (/. L. Gressitt); Guadalcanal 

 I., Munda, 15-30 m, 1 $, 14-15. vii. 1959 (/. L. Gressitt); Russell I., Yandina-Banika I., 100 m, 

 1 (J, 1 $, 26. vii. 1964 (R. Straatman). 



The holotype female of Coelidia aurulenta Walker is in poor condition. The 

 head, pronotum and scutellum are missing. The elytra, which are prominently 

 marked, were sufficiently diagnostic to allow comparison of the type with my own 

 material. 



Biology. Unknown. Collection records indicate that the species is found in 

 mangrove swamps in the Solomon Islands. It is prevalent from June to December. 



Remarks. This species is similar in male genital characteristics to coacta, 

 but can be separated from that species on the basis of the prominent flange on the 

 dorsal appendage of the aedeagus. 



Tharra coacta sp. n. 



(Text-figs 259-263) 



Length: £ 6-62 mm, O. unknown. 



General colour ochraceous with fuscous border along apex of elytra, and two small fuscous 

 spots basad of apex. Crown ochraceous; eyes fuscous; pronotum, scutellum and elytra 

 ochraceous. 



Head narrower than pronotum; crown long and narrow, produced distally beyond anterior 

 margin of eyes, distal length slightly over one-third entire median length, striate radially, 

 slightly depressed medially, lateral margins slightly convergent basally, disk elevated above 

 eyes; ocelli medium size, situated anteriolaterally ; eyes large, somewhat elongate, occupying 

 over half of entire dorsal area of head; pronotum short, median length about equal to median 

 length of crown, surface finely knobbed; scutellum large, median length greater than median 

 length of pronotum; elytra elongate, veins prominent, appendix well developed, venation 

 as in description of genus; clypeus long, broad anteriorly, narrowed posteriorly, without 



