182 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 95 
HEPTARTHROGASTER COSTARICENSIS, new species 
FIGURE 20, e, f 
Types.—Male and female, adults, from Crypturellus sowi modestus, 
collected by the author at Guapiles, Costa Rica, on March 10, 1903; 
in collection of author. 
Diagnosis.—Differs from latacephalus as follows: Slightly larger 
in size, head wider at frons in both sexes, while in the female the 
temples are of same width or slightly less, with length of head also 
slightly less; posterior margin of temples straight in both sexes (not 
rounded) and in the male the points are more attenuated and less 
rounded; tubercles at base of antennae in the female are shorter 
and less pointed; thoracic segments of slightly different porportions. 
The structure of the abdominal plates is practically the same as in 
latacephalus, but the abdomen in the female is also wider than long 
(longer than wide in latacephalus). 'The chaetotaxy seems to be 
very similar in both sexes but differs considerably from that of 
latacephalus (see fig.). 
The male genitalia are somewhat different, especially the endomeral 
plate (see fig.) ; the paramers are shorter, but of same width, while 
the endomeral plate is both shorter and narrower, and has the tip 
broad and truncated, with what seems to be a small penis. 
Remarks.—This species is of the general type of /atacephalus, 
although the head of the male in some respects resembles that of 
parvulus, except for shape of occipital margin. Species represented 
by two males and one female, including the types. 
The taking of this new type of Heptarthrogaster on two species of 
Crypturellus so far removed from each other, both geographically 
and systematically, presents further proof of the stability of the 
species of this genus. It is probable that the minutus and parvulus 
group are confined to the avian genus Tinamus and the latacephalus 
and costaricens?s group to Crypturellus. 
MEASUREMENTS OF HEPTARTHROGASTER COSTARICENSIS 
Male Female 
Strueture TUSTTTAA SRE UNSPGATAT RUST LITA CART KUL T CCRT ISTIC 
Length Width Length Width 
f 5-0 hi getvpune hope CN is Ae Mc be MTA aN Taro TUT HEN ECD ed TRAC A eyo 1.29 
FLONASE CRI WN Da dis A IAN bs COUR UI 0. 337 0. 38 
Freaa {trons Py WON ESR ai Ke VINEE EN Oe Oe 0.53 Wey | 0. 56 
HEADY BOX 0S fo cles UCL NN iHAEG DEAL SOAR ON SN ES EAS pes IAW Seeds MRL 0.11 0.35 0.12 0. 36 
Miso thorax cs uumiar nite tine Caen DAI Nee Oe INC EA a 0. 14 0. 52 0. 15 0. 56 
IVE ta thors xe ces ae MME y Saeko ar Eka a cea AA ALS UU 0.13 0. 49 0. 16 0. 53 
PAD GOIN Ory he AU GRAVATT LUNN CUA re ALE SAU Ce VAN ISNA aaa NC 0. 57 0. 655 0. 75 0. 78 
PASTY COT 1 Re Neely I NAL LEME APS NTU RR 0. 23 0. 065 0. 16 0. 04 
B Ed2y 2 ace) as fsn Og AI) UMA ESIC SLU ae ARS UT PN 0. 062 O80 751 Sees 
