NORTH AMERICAN HYMENOPTERA. 151 



22. Crabro centralis Cam. 



Crnbro centralis Cameron, Biol. Cent.-Amer., Hym. ii, p. 146. Tab. ix, figs. 

 6. 6a, b, <i %. 

 9 . — Head with strong, even punctures, which are closest and finer posteriorly, 

 frontal impressed line wanting, space between hind ocelli less than that between 

 them and the nearest eye-margin, the space between eyes at base of clypeus 

 slightly greater than the width of the latter in the middle ; pronotum distinctly 

 crested above, armed with a small, tliough distinct tooth on each side; dorsulum 

 more coarsely punctured than the head, closely so on anterior portion ; mesopleursB 

 coarsely striato-punctate, the episternal suture not distinctly foveolate, being 

 crossed by a few ridges; middle segment above rugoso-X)unctate, but not very 

 coarsely, the posterior face marked by strong transverse folds or ridges, sides 

 ratlier strongly striated, less distinctly so medially ; first segment of abdomen 

 with large, separated punctures, the second segment more closely and finely punc- 

 tured, and segments 3-5 even more closely, second ventral with coarse, scattered 

 punctures. Black including the tarsi ; small spot on mandibles on inner margin, 

 greater part of scape, pronotum, tubercles, metanotum more or less, a line on outer 

 side of tibife, a band on dorsal abdominal segments 2 5, sixth segment entirely, 

 and veutrals 2-5 narrowly at apex, yellow ; a rufous streak on hind femora above ; 

 head above clothed with a dense, brownish pile ; wings subhyaline. darker apically, 

 with a strong yellow streak along the costa ; abdomen with silvery sericeous pile. 

 Length 10 mm. 



Mexico; Guatemala and Panama (Cameron); Las Criices, New 

 Mexico (Cockerell ). The only specimen before me seems to agree with 

 Cameron's description of centralis, but the abdomen is strongly punc- 

 tured, and not finely as stated by Cameron. However, the meaning 

 of fineness and coarseness is no doubt viewed differently by various 

 authors. I have not seen the $ , and Cameron does not mention it in 

 his description, although giving figures of the genitalia and antennie. 

 It is difficult to imagine why that author compares eentralis to his 

 guerreren.sis, which, judging from the figure, belongs to a widely 

 separated group. 



6. Group decemmaculatus. 



Distinguished chiefly by the % flagellum being entire, not dentate 

 or emarginate ; the fore tarsi are not flattened ; abdomen distinctly 

 punctured ; pygidium with a distinct lateral fringe ; head closely 

 and finely punctured. The females offer no characters by which 

 they may be separated from those of the chnjsargmm group. 



23. Crabro tleceiuinaciilalus Say. 



Crabro 10- macul at us Say, West. Quart. Eep., ii, p. 78 ; Compl. Writ, i, p. 167. 

 Crabro coUinns Smith, Cat. Hym. B. M., iv, p. 420, % . 

 Crabro aurifrous Smith, iliid. p. 420, 9- 

 Cruliro 10-mnadatus Packard, 1. c. p. 79, 9 • 

 Crabro aiirifrons Packard (nee Smith), ibid. p. 80, % (non 9 ). 

 9 . — Head with the punctures distinct, more separated than in Packardii ; first 



TKANS. AM. ENT. SOC. XXII. JUNE. 1895. 



