AFRICAN NEUROPTKRA. 161 



l»RELIWI\AKY XOTES OX SOini: AFKItAX ODOXATA. 



BY PHILIP P. CALVERT. 



The Odoiuita collected at various places in West Africa 

 United States Eclipse Expedition to the Congo, and by Dr 

 A!)b()tt in Zanzibar and tlie Kilimanjaro region, were sent tt .r 



study from the United States National Museum, by Dr. C. V. .l^y. 

 Two pa[)ers containing the results of that study have alreadv been 

 placed in his hands, but as some time must elapse before their publi- 

 cation, I have drawn up the present abstract of the chief results — 

 with Dr. Riley's permission — for these Transactions. The papers 

 referred to contain complete lists, descriptions and figures. 



The two species of Orthetrum here described as new may [jossibly 

 be among the species already described by Burmeister or Rambur, 

 but from their descriptions I could not satisfactorily identify them. 

 As false determinations are even more troublesome than new syno- 

 nyms, it seemed better to risk the latter chance. 



Diplax (lilatata n. sp. — Brownish yellow ; frons with a rather wide band 

 ill front of the eyes and vertex, mentura, sutures of the thorax with stripes, a 

 broader, short stripe in front of the spiracle and an autehunieral stripe, the 

 greater part of the pectus, the feet except the inferior surface of the femora, ab- 

 dominal segment 1 at base, 2 and 3 a median dorsal spot, a spot each side of 

 dorsum near apex of 3-8, — black or dark brown. Wings hyaline, hindwiugs 

 light yellow at base, pterostigma brownish yellow, membranule white; front 

 wings: 9-10 antecnbitals, 10-12 postcubitals, four then three posttriangular rows. 

 Hind wings: G-7 antecubitals, 10-12 postcubitals, three then two posttriangular 

 rows increasing. 



%. — .Abdomen compressed at base, narrowing to base of 5, thence widening 

 and thickening to 7 (where it is wider than at base), thence nr rowing to apex, 

 which is a little wider than base of .5. Haniule bitid, interna' anch ending in 

 an acute hook, external i)ranch thicker, ajn^x obtuse; sui)p / appendages as 

 long as 8. 



9 . — Last seven abdominal segments wanting. 



Abdomen (ind. app.) % 26..5 — 31.5 mm. Hind wing % 33— 34..5 mm.. 9 34.5 

 mm. Width of base of fifth ab. seg. % 1.5, width of 7, 3 — 4 mm. 



Four males, one female, St. Helena (U. S. E. E.). 



TritliCiiiiM ferriiKaria Ramb., Near. p. 82. 

 9 . — Vidvar lamina produced a little beyond the ape.K of 10, its 



TRANS. AM. ENT. SOC. XIX. (21) JUNE, 1892. 



