1912] The Pezomachini of North America 115 
Although I have only separated out this one subgenus of 
Pezomachus it is evident when one is working over a quantity 
of material that there are several well defined groups of species 
in this genus which would suggest that though the species, 
especially in the female sex are very similar, this genus may in real- 
ity consist of degenerate forms from more than one genus or even 
tribe. Unfortunately the species recognized in the male sex, 
which would probably have more distinctive characters, are 
much fewer than those now described in the female sex and in 
only nine American species have the males and females been 
correlated. 
KEY TO THE SPECIES OF Thaumatotypus. 
IRemrAmiGcramcenl Set Ou te iam oils chp hak os ae nen er Rony ne elite fe ah 2 
Antenne 16-jointed; petiole striate, piceous species..... spinulatus sp. nov. 
2. Head and abdomen rufous, thorax, testaceous........... canadensis Harr. 
IN@tHSOREOlOUnEGietn s Ate te et atac at seaaaacn tie Mee creed tetra Sh Meee raw 3 
o.- Petiole striate, metathoracic teeth acute................. alaskensis Ashm. 
Petiole smooth, or with median line, metathoracic teeth not prominent 
tuberculatus Ashm. 
KEY TO THE NEW SPECIES OF Pezomachus HERE DESCRIBED. 
FEMALES. 
1. ‘‘Metathoracic’’ carina entirely absent; piceous species; length 4mm... 
P. utahensis 
“Metathoracic’’ carina indicated, either completely or only laterally.... 2 
Za Onipositon not more than nalias lone as\ the petiole. ......-...s......925- 3 
Ovipositor at least about the same length as the petiole.................. 4 
3. Antennze 19-jointed, abdominal pubescence dense; bicolored species 
fermucimoussand, blacks lengthy sro) latin. 52.0 .5.5.5-..962 -- P. brevistylus 
Antenne 17-jointed, abdominal pubescence sparse, piceous species, length 
TaGy saahaa Nerdy ess dis yee chan eicecl ats enc eens Mi eee ne eee P. minutus 
4, Ovipositor not much longer or shorter than the petiole................... 5 
Ovipositor 11% times as long as the petiole; length of species 5mm...... 
P. longistylus 
5. Abdominal pubescence rather long, moderately dense, antennz 17-jointed 
Miceous. species: length Zima ieee sect as ed ce see nena ne ets = P. robustus 
Se NOG Onna onbescence: SlOnte ie -etps tins tree + 1S boy ae nie ccs ee fete as Sskke 6 
Gay andonmnnualipulvescemcerdenser nace sae ae neni atc oe nes oe vee pi toe baw ae 7 
AindonamnallepubescenceiSparse.m versity ioaret se e 5s peste ees sche Seles eecyeneren 10 
7. Metathorax viewed from the side subconical, thorax fuscous, with black 
Dlctele crn lemet ab Agena sa apy ana ceased erie atten atan os oak P. maculatus 
INVetarbin@namett o tian ale princess eer preer Roseanne yu tee 292 fo onc saydyceleuers, cv ateu soars 8 
8. Petiolar spiracles so prominent that the general outline of the petiole is 
altered, sharply bi-colored species, head and abdominal apex black, 
A REM A UCe HeEV eC MONE Meera re mi teNy Berta ccrede Silexteya cad a Goat aot 5 P. coloradensis 
Penolarspiraclesnot at all) prommimenth. ...d.5... 2 dee a cis wee oe ele ws 9 
9. Meso- and meta-thorax sub-equaldrom above, densely pubescent. Black 
SPECIES ween caiimete same antler n eee ME ce eto rere nh daver dog eel e « P. longipes 
Mesothorax much shorter than ‘‘metathorax’’ the latter always with a 
mie Chicnamemo Opens teen. we a Nee he nse ahd swale P. standfordensis 
10. Petiolar spiracles so prominent that the general outline of the petiole is 
gillinsineGloc, BEBE ba o ob aso oy liceg coker Ole, Ord Ae eae tON OS Scena ceE etn em 11 
