Calvert : Odonata of the Neotropical Region. 195 



Abdominal dorsum obscure olive-brown, narrower on 9, absent on 

 to; articulations, ventral surface, all of 10, and the appendages 

 reddish. 



Abdomen S 20-21, ? 23.5 ; hind wing $ 13. 5-14, 9 16 mm. 



Brazil, Minas Geraes. 



Tigriagrion 24 genus novum. (Legion Agrion Selys. ) 



Arculus at, or very near to, the second antenodal ; M 2 (= nodal 

 sector, Selys) on the hind wings arising nearest the fourth postnodal ; 

 costal edge of the stigma of the hind wings shorter than the proximal 

 or distal edges; Cu t and Cu 2 (= upper and lower sectors of the tri- 

 angle) not reaching as far distad as the levels of origin of M and M 2 

 (= intranodal and nodal sectors) ; A (= lower or inferior sector of 

 the triangle) separating from the hind margin proximal to, or less 

 frequently at, the cubito-anal cross-vein (= basal postcostal), which is 

 situated nearer to the level of the first than to that of the second ante- 

 nodal ; venation of the tips of front and hind wings similar, abdomen 

 chiefly red, tenth segment of the male not elevated dorsally, vulvar 

 spine? 



Type : Tigriagrion aurantinigrum, sp. nov. 



1 01. Tigriagrion aurantinigrum, sp. nov. 



( Plate V, figs. 104, 105; Pi ate VIII, fig. 143.) 



6\ Head and thorax orange-red, with the following black markings : 

 a line on the fronto-nasal suture ; a transverse frontal line ; a narrow 

 ring almost encircling each ocellus ; a fine ring surrounding the three 

 ocelli, giving off on each side a stripe toward, but not to, the antenna, 

 and confluent with a transverse stripe behind the lateral ocelli, which 

 stripe is prolonged at each end obliquely forward to the eye of the 

 same side ; a curved stripe on each side (confluent or not confluent 

 with the transverse stripe) almost surrounding, except on the inner 

 (mesial) side, an orange area corresponding to the pale postocular spot 

 of allied genera, this area dotted with black ; most of the middle pro- 

 thoracic lobe (leaving a pair of short median lines and a larger spot 

 on each side orange); a stripe on each side of the mid-dorsal carina 

 (which remains orange) two-fifths as wide at mid-height as the mesepi- 



24 From riypig and Agrion, in allusion to the black and orange markings of the 

 head and thorax of the type species. The nearest ally of Tigriagrion is perhaps 

 Telebasis (Selys) Kirby (= Erythrogrion Selys). 



